Understanding variables is really important for solving linear equations, especially if you're studying for your GCSE math. Here’s why:

1. What are Variables?
   Variables are like empty boxes that hold numbers we don’t know yet. For example, in the equation (2x + 5 = 15), the (x) is a variable that we need to figure out.

2. Setting up Equations:
   When you learn to change real-life problems into math equations, knowing how to use your variables is very important. It helps you organize your ideas and see what you’re trying to find.

3. Manipulating Equations:
   When you understand how variables work, you can change the equations easily. For example, to solve for (x) in (2x + 5 = 15), you can subtract (5) from both sides. This simplifies the equation to (2x = 10).

4. Application and Problem Solving:
   Variables show up all the time in math. By getting comfortable with them in linear equations, you'll be ready to handle more complicated math later.

So, when you really understand how variables work, it helps you solve equations with confidence and accuracy!