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数学数学261 views·Updated Jun 28, 2026·1 page

一次関数の基本

礼零@_s8iiv

数学の比例と一次関数について学んでいくよ!水面の高さの変化を通して、比例と一次関数の違いや式の作り方を理解していこう。

1
of 1
●P58 水面の高さは?

(1) 2ずつ増える

(2)2倍、3倍、4倍と増える

(3)g=2x 比列の式。

y=2x+8一次関数の式

一次関数の式

y=ax+b

b=0のとき

まこaxとなって比列の式になる。

P611

(3)○ (1) × (う)0(土) 0

比例と一次関数の見分け方

水面の高さの問題を使って、比例と一次関数の違いを理解しよう。数値が「2ずつ増える」場合と「2倍、3倍、4倍と増える」場合では、全然違う式になるんだ。

比例の式y = ax の形で表される。例えば y = 2x のように、xが2倍になればyも2倍になる関係だよ。

一次関数の式y = ax + b の形になる。y = 2x + 8 のように、比例の式に定数bが加わったものなんだ。ここで重要なのは、b = 0のときは y = ax となって比例の式になるということ!

💡 ポイント: 一次関数でb = 0なら比例になる。つまり比例は一次関数の特別なケースだよ。

練習問題では、y = (1/3)x + 0 のような式も出てくる。これはb = 0だから比例の式と同じ意味になるね。

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What is the Knowunity AI companion?

Our AI companion is specifically built for the needs of students. Based on the millions of content pieces we have on the platform we can provide truly meaningful and relevant answers to students. But its not only about answers, the companion is even more about guiding students through their daily learning challenges, with personalised study plans, quizzes or content pieces in the chat and 100% personalisation based on the students skills and developments.

Where can I download the Knowunity app?

You can download the app in the Google Play Store and in the 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.

Most popular content in 数学

9

Most popular content

9

Can't find what you're looking for? Explore other subjects.

Students love us — and so will you.

4.6/5App Store
4.7/5Google 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 SiOS 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 KlichAndroid 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.

AnnaiOS user

数学数学261 views·Updated Jun 28, 2026·1 page

一次関数の基本

礼零@_s8iiv

数学の比例と一次関数について学んでいくよ!水面の高さの変化を通して、比例と一次関数の違いや式の作り方を理解していこう。

1
of 1
●P58 水面の高さは?

(1) 2ずつ増える

(2)2倍、3倍、4倍と増える

(3)g=2x 比列の式。

y=2x+8一次関数の式

一次関数の式

y=ax+b

b=0のとき

まこaxとなって比列の式になる。

P611

(3)○ (1) × (う)0(土) 0

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比例と一次関数の見分け方

水面の高さの問題を使って、比例と一次関数の違いを理解しよう。数値が「2ずつ増える」場合と「2倍、3倍、4倍と増える」場合では、全然違う式になるんだ。

比例の式y = ax の形で表される。例えば y = 2x のように、xが2倍になればyも2倍になる関係だよ。

一次関数の式y = ax + b の形になる。y = 2x + 8 のように、比例の式に定数bが加わったものなんだ。ここで重要なのは、b = 0のときは y = ax となって比例の式になるということ!

💡 ポイント: 一次関数でb = 0なら比例になる。つまり比例は一次関数の特別なケースだよ。

練習問題では、y = (1/3)x + 0 のような式も出てくる。これはb = 0だから比例の式と同じ意味になるね。

We thought you’d never ask...

What is the Knowunity AI companion?

Our AI companion is specifically built for the needs of students. Based on the millions of content pieces we have on the platform we can provide truly meaningful and relevant answers to students. But its not only about answers, the companion is even more about guiding students through their daily learning challenges, with personalised study plans, quizzes or content pieces in the chat and 100% personalisation based on the students skills and developments.

Where can I download the Knowunity app?

You can download the app in the Google Play Store and in the 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.

Most popular content in 数学

9

Most popular content

9

Can't find what you're looking for? Explore other subjects.

Students love us — and so will you.

4.6/5App Store
4.7/5Google 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 SiOS 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 KlichAndroid 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.

AnnaiOS user