Funktionen sind überall um uns herum - von der Handyrechnung... Show more
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886
•
Updated Mar 15, 2026
•
Charlotte
@charlotte_kzmi
Funktionen sind überall um uns herum - von der Handyrechnung... Show more





Funktionen sind wie Maschinen, die aus jeder Eingabe genau eine Ausgabe machen. Wenn du eine Zahl reinsteckst, kommt immer genau eine andere Zahl raus - nie zwei verschiedene!
Mathematiker schreiben das so: f: x → y. Das x nennt man Funktionsstelle (deine Eingabe) und das y heißt Funktionswert (was rauskommt). Funktionen haben Namen wie f, g oder h.
Die Funktionsgleichung ist dein Rezept zum Rechnen. Zum Beispiel: f(x) = 3x² + 5. Setzt du x = 2 ein, rechnest du 3 · 2² + 5 = 17. Der Funktionsgraph zeigt alle diese Punkte als Bild.
Merkspruch: Eine Funktion ist wie ein Automat - eine Eingabe, eine Ausgabe!

Lineare Funktionen haben die Form y = mx + b und ihr Graph ist immer eine gerade Linie. Das macht sie super einfach zu verstehen!
m ist die Steigung - sie zeigt, wie steil deine Gerade ist. Ist m positiv, geht die Gerade nach oben. Ist m negativ, fällt sie nach unten. Bei m = 0 läuft sie völlig flach.
b ist der y-Achsenabschnitt - dort schneidet deine Gerade die y-Achse. Wenn b = 0 ist, läuft die Gerade durch den Ursprung und heißt proportionale Funktion.
Tipp: Denk an eine Treppe - m sagt dir, wie steil sie ist, b sagt dir, wo sie an der Wand startet!

Wenn du zwei Punkte auf einer Geraden hast, kannst du die Steigung ganz einfach ausrechnen. Die Steigungsformel lautet: m = /.
Du rechnest also: Unterschied der y-Werte geteilt durch Unterschied der x-Werte. Das funktioniert mit jedem Punktepaar auf deiner Gerade.
Den y-Achsenabschnitt b findest du, indem du einen Punkt und die Steigung in y = mx + b einsetzt. Dann löst du einfach nach b auf.
Eselsbrücke: "Hoch durch rechts" - erst schaust du, wie weit du nach oben gehst, dann wie weit nach rechts!

Lineare Ungleichungen funktionieren fast wie normale Gleichungen - nur mit < oder > statt =. Du suchst alle x-Werte, wo deine Funktion kleiner oder größer als eine bestimmte Zahl ist.
Die Äquivalenzumformungen kennst du schon: Du darfst addieren, subtrahieren und mit positiven Zahlen multiplizieren oder dividieren. Aber Achtung! Bei negativen Zahlen musst du das Relationszeichen umdrehen (aus < wird >).
Das bedeutet: Multiplizierst du mit -2, wird aus 3x < 6 dann -6x > -12. Das Zeichen kippt um, weil negative Zahlen die Reihenfolge ändern.
Wichtig: Bei Multiplikation/Division mit negativen Zahlen immer das Ungleichheitszeichen umdrehen!
Our AI Companion is a student-focused AI tool that offers more than just answers. Built on millions of Knowunity resources, it provides relevant information, personalised study plans, quizzes, and content directly in the chat, adapting to your individual learning journey.
You can download the app from Google Play Store and Apple App Store.
That's right! Enjoy free access to study content, connect with fellow students, and get instant help – all at your fingertips.
Erfahren Sie, wie man Schnittpunkte und Nullstellen linearer Funktionen berechnet. Diese Zusammenfassung behandelt die Schritte zur Bestimmung von Schnittpunkten durch Gleichsetzen der Funktionsgleichungen, das Berechnen von Nullstellen und das Ablesen von Funktionen am Graphen. Ideal für Schüler, die sich auf Prüfungen vorbereiten oder ihr Verständnis von linearen Funktionen vertiefen möchten.
App Store
Google Play
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
Best app on earth! no words because it’s too good
Thomas R
iOS user
Just amazing. Let's me revise 10x better, this app is a quick 10/10. I highly recommend it to anyone. I can watch and search for notes. I can save them in the subject folder. I can revise it any time when I come back. If you haven't tried this app, you're really missing out.
Basil
Android user
This app has made me feel so much more confident in my exam prep, not only through boosting my own self confidence through the features that allow you to connect with others and feel less alone, but also through the way the app itself is centred around making you feel better. It is easy to navigate, fun to use, and helpful to anyone struggling in absolutely any way.
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
very reliable app to help and grow your ideas of Maths, English and other related topics in your works. please use this app if your struggling in areas, this app is key for that. wish I'd of done a review before. and it's also free so don't worry about that.
Rohan U
Android user
I know a lot of apps use fake accounts to boost their reviews but this app deserves it all. Originally I was getting 4 in my English exams and this time I got a grade 7. I didn’t even know about this app three days until the exam and it has helped A LOT. Please actually trust me and use it as I’m sure you too will see developments.
Xander S
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE Knowunity AI. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This apps acc the goat. I find revision so boring but this app makes it so easy to organize it all and then you can ask the freeeee ai to test yourself so good and you can easily upload your own stuff. highly recommend as someone taking mocks now
Paul T
iOS user
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
Best app on earth! no words because it’s too good
Thomas R
iOS user
Just amazing. Let's me revise 10x better, this app is a quick 10/10. I highly recommend it to anyone. I can watch and search for notes. I can save them in the subject folder. I can revise it any time when I come back. If you haven't tried this app, you're really missing out.
Basil
Android user
This app has made me feel so much more confident in my exam prep, not only through boosting my own self confidence through the features that allow you to connect with others and feel less alone, but also through the way the app itself is centred around making you feel better. It is easy to navigate, fun to use, and helpful to anyone struggling in absolutely any way.
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
very reliable app to help and grow your ideas of Maths, English and other related topics in your works. please use this app if your struggling in areas, this app is key for that. wish I'd of done a review before. and it's also free so don't worry about that.
Rohan U
Android user
I know a lot of apps use fake accounts to boost their reviews but this app deserves it all. Originally I was getting 4 in my English exams and this time I got a grade 7. I didn’t even know about this app three days until the exam and it has helped A LOT. Please actually trust me and use it as I’m sure you too will see developments.
Xander S
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE Knowunity AI. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This apps acc the goat. I find revision so boring but this app makes it so easy to organize it all and then you can ask the freeeee ai to test yourself so good and you can easily upload your own stuff. highly recommend as someone taking mocks now
Paul T
iOS user
Charlotte
@charlotte_kzmi
Funktionen sind überall um uns herum - von der Handyrechnung bis zur Geschwindigkeit beim Fahrradfahren. Du lernst hier, wie Mathematiker diese Zusammenhänge beschreiben und mit ihnen rechnen.

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Improve your grades
Join milions of students
Funktionen sind wie Maschinen, die aus jeder Eingabe genau eine Ausgabe machen. Wenn du eine Zahl reinsteckst, kommt immer genau eine andere Zahl raus - nie zwei verschiedene!
Mathematiker schreiben das so: f: x → y. Das x nennt man Funktionsstelle (deine Eingabe) und das y heißt Funktionswert (was rauskommt). Funktionen haben Namen wie f, g oder h.
Die Funktionsgleichung ist dein Rezept zum Rechnen. Zum Beispiel: f(x) = 3x² + 5. Setzt du x = 2 ein, rechnest du 3 · 2² + 5 = 17. Der Funktionsgraph zeigt alle diese Punkte als Bild.
Merkspruch: Eine Funktion ist wie ein Automat - eine Eingabe, eine Ausgabe!

Access to all documents
Improve your grades
Join milions of students
Lineare Funktionen haben die Form y = mx + b und ihr Graph ist immer eine gerade Linie. Das macht sie super einfach zu verstehen!
m ist die Steigung - sie zeigt, wie steil deine Gerade ist. Ist m positiv, geht die Gerade nach oben. Ist m negativ, fällt sie nach unten. Bei m = 0 läuft sie völlig flach.
b ist der y-Achsenabschnitt - dort schneidet deine Gerade die y-Achse. Wenn b = 0 ist, läuft die Gerade durch den Ursprung und heißt proportionale Funktion.
Tipp: Denk an eine Treppe - m sagt dir, wie steil sie ist, b sagt dir, wo sie an der Wand startet!

Access to all documents
Improve your grades
Join milions of students
Wenn du zwei Punkte auf einer Geraden hast, kannst du die Steigung ganz einfach ausrechnen. Die Steigungsformel lautet: m = /.
Du rechnest also: Unterschied der y-Werte geteilt durch Unterschied der x-Werte. Das funktioniert mit jedem Punktepaar auf deiner Gerade.
Den y-Achsenabschnitt b findest du, indem du einen Punkt und die Steigung in y = mx + b einsetzt. Dann löst du einfach nach b auf.
Eselsbrücke: "Hoch durch rechts" - erst schaust du, wie weit du nach oben gehst, dann wie weit nach rechts!

Access to all documents
Improve your grades
Join milions of students
Lineare Ungleichungen funktionieren fast wie normale Gleichungen - nur mit < oder > statt =. Du suchst alle x-Werte, wo deine Funktion kleiner oder größer als eine bestimmte Zahl ist.
Die Äquivalenzumformungen kennst du schon: Du darfst addieren, subtrahieren und mit positiven Zahlen multiplizieren oder dividieren. Aber Achtung! Bei negativen Zahlen musst du das Relationszeichen umdrehen (aus < wird >).
Das bedeutet: Multiplizierst du mit -2, wird aus 3x < 6 dann -6x > -12. Das Zeichen kippt um, weil negative Zahlen die Reihenfolge ändern.
Wichtig: Bei Multiplikation/Division mit negativen Zahlen immer das Ungleichheitszeichen umdrehen!
Our AI Companion is a student-focused AI tool that offers more than just answers. Built on millions of Knowunity resources, it provides relevant information, personalised study plans, quizzes, and content directly in the chat, adapting to your individual learning journey.
You can download the app from Google Play Store and Apple App Store.
That's right! Enjoy free access to study content, connect with fellow students, and get instant help – all at your fingertips.
9
Smart Tools NEW
Transform this note into: ✓ 50+ Practice Questions ✓ Interactive Flashcards ✓ Full Mock Exam ✓ Essay Outlines
Erfahre alles über lineare Funktionen: Bestimme Funktionsgleichungen, finde Nullstellen, analysiere Steigungsdreiecke und erkenne parallele sowie senkrechte Linien. Ideal für Schüler, die ihre Kenntnisse in der Mathematik vertiefen möchten.
Entdecken Sie die Grundlagen linearer Funktionen, einschließlich der Bestimmung von Steigungen, Nullstellen und der Beziehung zwischen parallelen Linien. Diese Zusammenfassung bietet klare Erklärungen und Beispiele zur Berechnung von Funktionsgleichungen und zum Zeichnen von Graphen. Ideal für Schüler, die ihre Kenntnisse in Mathematik vertiefen möchten.
Erfahren Sie, wie Sie ganzrationale Funktionen durch Kurvenanpassung bestimmen. Diese Zusammenfassung behandelt die allgemeine Funktionsgleichung, das Einsetzen von Punkten in Gleichungssysteme, die Berechnung von Hoch- und Wendepunkten sowie die Analyse der Steigung. Ideal für Studierende der Mathematik, die sich auf Kurvendiskussionen vorbereiten.
Dieser Lernzettel bietet eine umfassende Übersicht über lineare Funktionen, einschließlich der allgemeinen Form, der Berechnung von Funktionsgleichungen aus Punkten und Steigungen, dem Schnittpunkt zweier Geraden sowie der Bestimmung von Nullstellen und Y-Achsenabschnitten. Ideal für Schüler der 8. Klasse, die ihre Kenntnisse in Mathematik vertiefen möchten.
Erlernen Sie, wie man Funktionsgleichungen aus gegebenen Punkten und Steigungen berechnet. Diese Zusammenfassung behandelt die Bestimmung von Schnittpunkten, Nullstellen und die allgemeine Form linearer Funktionen. Ideal für Mathematikstudenten, die ihre Fähigkeiten in der Funktionsanalyse verbessern möchten.
Entdecken Sie die Grundlagen linearer Funktionen, einschließlich der Bestimmung von Funktionsgleichungen, Steigungen und der Überprüfung von Punkten auf Geraden. Diese Zusammenfassung bietet klare Erklärungen zu den Konzepten der Definitions- und Wertemenge sowie zur Berechnung von Schnittpunkten und Nullstellen. Ideal für Schüler der 8. Klasse im Mathematikunterricht.
Erfahren Sie, wie man Schnittpunkte und Nullstellen linearer Funktionen berechnet. Diese Zusammenfassung behandelt die Schritte zur Bestimmung von Schnittpunkten durch Gleichsetzen der Funktionsgleichungen, das Berechnen von Nullstellen und das Ablesen von Funktionen am Graphen. Ideal für Schüler, die sich auf Prüfungen vorbereiten oder ihr Verständnis von linearen Funktionen vertiefen möchten.
App Store
Google Play
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
Best app on earth! no words because it’s too good
Thomas R
iOS user
Just amazing. Let's me revise 10x better, this app is a quick 10/10. I highly recommend it to anyone. I can watch and search for notes. I can save them in the subject folder. I can revise it any time when I come back. If you haven't tried this app, you're really missing out.
Basil
Android user
This app has made me feel so much more confident in my exam prep, not only through boosting my own self confidence through the features that allow you to connect with others and feel less alone, but also through the way the app itself is centred around making you feel better. It is easy to navigate, fun to use, and helpful to anyone struggling in absolutely any way.
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
very reliable app to help and grow your ideas of Maths, English and other related topics in your works. please use this app if your struggling in areas, this app is key for that. wish I'd of done a review before. and it's also free so don't worry about that.
Rohan U
Android user
I know a lot of apps use fake accounts to boost their reviews but this app deserves it all. Originally I was getting 4 in my English exams and this time I got a grade 7. I didn’t even know about this app three days until the exam and it has helped A LOT. Please actually trust me and use it as I’m sure you too will see developments.
Xander S
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE Knowunity AI. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This apps acc the goat. I find revision so boring but this app makes it so easy to organize it all and then you can ask the freeeee ai to test yourself so good and you can easily upload your own stuff. highly recommend as someone taking mocks now
Paul T
iOS user
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
Best app on earth! no words because it’s too good
Thomas R
iOS user
Just amazing. Let's me revise 10x better, this app is a quick 10/10. I highly recommend it to anyone. I can watch and search for notes. I can save them in the subject folder. I can revise it any time when I come back. If you haven't tried this app, you're really missing out.
Basil
Android user
This app has made me feel so much more confident in my exam prep, not only through boosting my own self confidence through the features that allow you to connect with others and feel less alone, but also through the way the app itself is centred around making you feel better. It is easy to navigate, fun to use, and helpful to anyone struggling in absolutely any way.
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
very reliable app to help and grow your ideas of Maths, English and other related topics in your works. please use this app if your struggling in areas, this app is key for that. wish I'd of done a review before. and it's also free so don't worry about that.
Rohan U
Android user
I know a lot of apps use fake accounts to boost their reviews but this app deserves it all. Originally I was getting 4 in my English exams and this time I got a grade 7. I didn’t even know about this app three days until the exam and it has helped A LOT. Please actually trust me and use it as I’m sure you too will see developments.
Xander S
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE Knowunity AI. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This apps acc the goat. I find revision so boring but this app makes it so easy to organize it all and then you can ask the freeeee ai to test yourself so good and you can easily upload your own stuff. highly recommend as someone taking mocks now
Paul T
iOS user