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## Algebra basics (ASL)

### Course: Algebra basics (ASL) > Unit 2

Lesson 2: Substitution & evaluating expressions (ASL)# 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, plus, 2, p, minus, 3, r. Well, first we need to know the values of p and r. For example, to evaluate the expression when start color #11accd, p, equals, 4, end color #11accd and start color #e07d10, r, equals, 5, end color #e07d10, we just replace start color #11accd, p, end color #11accd with start color #11accd, 4, end color #11accd and start color #e07d10, r, end color #e07d10 with start color #e07d10, 5, end color #e07d10:

So, the expression 10, plus, 2, p, minus, 3, r equals 3 when p, equals, 4 and r, equals, 5.

## Now, let's practice

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