Mastering Linear Equations | 掌握一元一次方程

📚 Mastering Linear Equations | 掌握一元一次方程

Linear equations are the foundation of algebra at KS3. They appear in almost every Cambridge Checkpoint test and are essential for later topics such as graphs, sequences and simultaneous equations. In this article, we will build your confidence step by step, from simple one-step equations to equations with brackets and unknowns on both sides.

一元一次方程是 KS3 代数的基础。它们几乎出现在每一次剑桥 Checkpoint 考试中，并且对后续的图形、数列和联立方程等主题至关重要。本文将一步一步帮助你建立信心，从简单的一步方程到含括号和两边含未知数的方程。

1. What is a Linear Equation? | 什么是一元一次方程？

A linear equation is an equation in which the unknown appears only to the power of 1. It can usually be written in the form ax + b = c, where a, b and c are numbers and x is the unknown.

一元一次方程是指未知数只出现一次方（指数为 1）的方程。它通常可以写成 ax + b = c 的形式，其中 a、b 和 c 是数字，x 是未知数。

For example, 2x + 3 = 11 is linear because the highest power of x is 1. An equation such as x² + 4 = 20 is not linear because the unknown is squared.

例如，

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