Rovnice sú ako matematické hádanky, kde hľadáme neznáme číslo označené... Show more
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Updated Mar 13, 2026
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Jak řešit jednoduché lineární rovnice
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Úvod do riešenia rovníc a kľúčové pojmy
Rovnice ti pomôžu nájsť neznáme čísla a vyriešiť tak matematické "záhady". Predstav si to ako váhy, ktoré musíš udržať v rovnováhe.
Rovnica je matematický zápis s dvoma stranami spojenými znakom rovnosti (=), kde sa nachádza nejaká neznáma (najčastejšie x). Ľavá strana (ĽS) je všetko naľavo od znaku =, pravá strana (PS) je všetko napravo.
Koreň rovnice je to správne číslo, ktoré keď dosadíš za x, ľavá strana sa bude rovnať pravej. Ekvivalentné úpravy sú zmeny, ktoré môžeš s rovnicou robiť bez toho, aby sa zmenilo jej riešenie - ako keď pridáš na obe strany váh rovnaké závažie.
Tip: Lineárna rovnica je tá najjednoduchšia - neznáma x je v nej vždy "sama", nie je tam x² ani x³.
Ekvivalentné úpravy a postup riešenia
Tvoj cieľ je dostať neznámu x samotnú na jednu stranu a výsledok na druhú. Máš na to tri nástroje, ale vždy musíš urobiť tú istú zmenu na oboch stranách!
Pričítanie alebo odčítanie rovnakého čísla k obom stranám. Ak máš x - 3 = 7, pripočítaj k obom stranám 3 a dostaneš x = 10. Násobenie alebo delenie oboch strán rovnakým číslom (nie nulou!). Pri 2x = 10 vydeľ obe strany 2 a máš x = 5.
Postup je jednoduchý: najprv zjednoduš čo sa dá, potom presuň všetky x na jednu stranu a čísla na druhú. Keď presúvaš cez znak =, zmeň znamienko! Nakonec izoluj x delením alebo násobením.
Dôležité: Vždy si urob skúšku správnosti - dosaď výsledok do pôvodnej rovnice a skontroluj, či sa ľavá strana rovná pravej!
Riešené príklady krok za krokom
Pozrime si, ako riešiť rovnice na konkrétnych príkladoch. Každý krok si dobre zapamätaj.
Príklad 1: x + 7 = 15. Chceš sa zbaviť +7, takže od oboch strán odčítaj 7: x + 7 - 7 = 15 - 7, teda x = 8. Skúška: 8 + 7 = 15 ✓
Príklad 2: 4x - 6 = 14. Najprv pripočítaj 6: 4x = 20. Potom vydeľ 4: x = 5. Skúška: 4×5 - 6 = 20 - 6 = 14 ✓
Príklad 3: 3x + 2 = x + 10. Presuň x z pravej strany: 3x - x + 2 = 10, teda 2x + 2 = 10. Presuň číslo 2: 2x = 8. Vydeľ 2: x = 4. Skúška: 3×4 + 2 = 4 + 10, teda 14 = 14 ✓
Pamätaj si: Keď presúvaš člen cez znak =, vždy mu zmeň znamienko na opačné!
Dôležité pravidlá a tipy na záver
Zapamätaj si tieto kľúčové pravidlá, ktoré ti zabezpečia úspech pri riešení lineárnych rovníc. Sú to tvoje najlepšie pomocníky!
Vždy to isté na oboch stranách - toto je najdôležitejšie pravidlo. Čo urobíš na ľavej strane, musíš urobiť aj na pravej. Pozor na znamienka - pri presúvaní cez = sa z + stáva - a naopak. Nulou sa nedelí - nikdy!
Skúška správnosti je tvoj najlepší kamarát - vždy si prevez výsledok dosadením do pôvodnej rovnice. Najprv zjednoduš všetko, čo sa dá, potom postupuj systematicky. Môžeš si úpravy písať za lomítko, napríklad x + 5 = 10 /−5.
Povzbudenie: Riešenie rovníc je ako hra - čím viac cvičíš, tým lepší sa staneš. Každá rovnica má svoje riešenie a ty ho dokážeš nájsť!
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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.
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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
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Best app on earth! no words because it’s too good
Thomas R
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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
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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.
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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!
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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
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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
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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
Jak řešit jednoduché lineární rovnice
Rovnice sú ako matematické hádanky, kde hľadáme neznáme číslo označené väčšinou písmenom x. Je to detektívna práca, ktorá ti pomôže vyriešiť množstvo problémov v matematike i v bežnom živote.
Úvod do riešenia rovníc a kľúčové pojmy
Rovnice ti pomôžu nájsť neznáme čísla a vyriešiť tak matematické "záhady". Predstav si to ako váhy, ktoré musíš udržať v rovnováhe.
Rovnica je matematický zápis s dvoma stranami spojenými znakom rovnosti (=), kde sa nachádza nejaká neznáma (najčastejšie x). Ľavá strana (ĽS) je všetko naľavo od znaku =, pravá strana (PS) je všetko napravo.
Koreň rovnice je to správne číslo, ktoré keď dosadíš za x, ľavá strana sa bude rovnať pravej. Ekvivalentné úpravy sú zmeny, ktoré môžeš s rovnicou robiť bez toho, aby sa zmenilo jej riešenie - ako keď pridáš na obe strany váh rovnaké závažie.
Tip: Lineárna rovnica je tá najjednoduchšia - neznáma x je v nej vždy "sama", nie je tam x² ani x³.
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Ekvivalentné úpravy a postup riešenia
Tvoj cieľ je dostať neznámu x samotnú na jednu stranu a výsledok na druhú. Máš na to tri nástroje, ale vždy musíš urobiť tú istú zmenu na oboch stranách!
Pričítanie alebo odčítanie rovnakého čísla k obom stranám. Ak máš x - 3 = 7, pripočítaj k obom stranám 3 a dostaneš x = 10. Násobenie alebo delenie oboch strán rovnakým číslom (nie nulou!). Pri 2x = 10 vydeľ obe strany 2 a máš x = 5.
Postup je jednoduchý: najprv zjednoduš čo sa dá, potom presuň všetky x na jednu stranu a čísla na druhú. Keď presúvaš cez znak =, zmeň znamienko! Nakonec izoluj x delením alebo násobením.
Dôležité: Vždy si urob skúšku správnosti - dosaď výsledok do pôvodnej rovnice a skontroluj, či sa ľavá strana rovná pravej!
Sign up to see the contentIt's free!
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Riešené príklady krok za krokom
Pozrime si, ako riešiť rovnice na konkrétnych príkladoch. Každý krok si dobre zapamätaj.
Príklad 1: x + 7 = 15. Chceš sa zbaviť +7, takže od oboch strán odčítaj 7: x + 7 - 7 = 15 - 7, teda x = 8. Skúška: 8 + 7 = 15 ✓
Príklad 2: 4x - 6 = 14. Najprv pripočítaj 6: 4x = 20. Potom vydeľ 4: x = 5. Skúška: 4×5 - 6 = 20 - 6 = 14 ✓
Príklad 3: 3x + 2 = x + 10. Presuň x z pravej strany: 3x - x + 2 = 10, teda 2x + 2 = 10. Presuň číslo 2: 2x = 8. Vydeľ 2: x = 4. Skúška: 3×4 + 2 = 4 + 10, teda 14 = 14 ✓
Pamätaj si: Keď presúvaš člen cez znak =, vždy mu zmeň znamienko na opačné!
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Dôležité pravidlá a tipy na záver
Zapamätaj si tieto kľúčové pravidlá, ktoré ti zabezpečia úspech pri riešení lineárnych rovníc. Sú to tvoje najlepšie pomocníky!
Vždy to isté na oboch stranách - toto je najdôležitejšie pravidlo. Čo urobíš na ľavej strane, musíš urobiť aj na pravej. Pozor na znamienka - pri presúvaní cez = sa z + stáva - a naopak. Nulou sa nedelí - nikdy!
Skúška správnosti je tvoj najlepší kamarát - vždy si prevez výsledok dosadením do pôvodnej rovnice. Najprv zjednoduš všetko, čo sa dá, potom postupuj systematicky. Môžeš si úpravy písať za lomítko, napríklad x + 5 = 10 /−5.
Povzbudenie: Riešenie rovníc je ako hra - čím viac cvičíš, tým lepší sa staneš. Každá rovnica má svoje riešenie a ty ho dokážeš nájsť!
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
We thought you’d never ask...
What is the Knowunity AI companion?
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.
Where can I download the Knowunity app?
You can download the app from Google Play Store and Apple App Store.
Is Knowunity really free of charge?
That's right! Enjoy free access to study content, connect with fellow students, and get instant help – all at your fingertips.
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Students love us — and so will you.
4.6/5
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4.7/5
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