📚 Forming and Solving Equations | IB数学：摆方程及其求解方法
In IB Mathematics, forming equations is a fundamental skill that bridges real-world situations and algebraic manipulation. Whether you are working on Paper 2 problem-solving questions or exploring mathematical modelling, the ability to translate a given condition into an equation is essential. This article will guide you through the process of setting up equations and the key methods used to solve them.
在IB数学中，摆方程（列方程）是一项连接现实情境与代数运算的基础技能。无论是应对Paper 2的实际应用题，还是进行数学建模，能够将给定条件转化为方程都至关重要。本文将带你系统梳理摆方程的步骤，以及求解方程的常用方法。
1. What Does ‘Forming an Equation’ Mean? | 什么是”摆方程”？
An equation is a mathematical statement that two expressions are equal. Forming an equation means creating that statement from the information given in a problem. It often involves choosing a variable to represent an unknown quantity, then using the relationships described in the problem to construct an expression that equals another expression or a known value.
方程是表示两个表达式相等的数学陈述。摆方程就是根据题目给出的信息构造这样的等式。通常需要先选择一个变量表示未知量，再利用题目中的数量关系，构造出一个表达式等于另一个表达式或已知数值。
For example, the statement ‘the sum of a number and 5 is 12’ can be written as:
例如，’一个数与5的和等于12’这句话可以写成：
x + 5 = 12
Here x is the unknown number. The process of forming an equation helps us turn a word problem into a form that can be solved algebraically.
这里的x就是未知数。摆方程的过程能帮助我们把文字题转化为可以用代数方法求解的形式。
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