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### Course: Algebra (all content) > Unit 1

Lesson 3: Substitution and evaluating expressions# Evaluating expressions with two variables

We've already evaluated expressions with one variable. Now it's time to do it with two variables.

## How to evaluate an expression with two variables

Let's say we want to evaluate the expression $10+2p-3r$ . Well, first we need to know the values of $p$ and $r$ . For example, to evaluate the expression when ${p=4}$ and ${r=5}$ , we just replace ${p}$ with ${4}$ and ${r}$ with ${5}$ :

So, the expression $10+2p-3r$ equals $3$ when $p=4$ and $r=5$ .

## Now, let's practice

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