When we talk about using different numbers in an algebra expression, we are really looking at how those numbers change the result. Let's make it super simple!

What Is Substitution?

An algebra expression usually has letters called variables. These letters stand for numbers. For example, take this expression: $2x + 3$. In this case, $x$ is the variable.

How Different Numbers Change Things

When we put different numbers in for $x$, we get different results from the expression. Let’s look at a couple of examples:

1. If $x = 2$: $2(2) + 3 = 4 + 3 = 7$

2. If $x = 5$: $2(5) + 3 = 10 + 3 = 13$

As you can see, when we changed the value of $x$, we got different answers: 7 and 13.

Why Does This Matter?

Using different numbers helps us understand the expression better:

• Finding Exact Answers: This is helpful for solving problems or equations in real life.
• Testing Out Ideas: You can see how changing one number affects the result.

In short, trying out different numbers gives us a better understanding of the algebra expression and how we can use it. So next time you replace a value, remember that you're discovering new answers!