Evaluating Expressions by Substitution

Evaluating Expressions by Substitution
Introduction

Evaluating an expression by substitution means replacing a variable with a given number and then calculating the result. This skill connects abstract algebraic no...

John collects stickers as a hobby. He already has 50 stickers and gets 10 new stickers every day.

Because the number of days can change, we can represent the total number of stickers using an expression.

Let x represent the number of days. The expression can be written as 50 + 10x. This means we add 50 to 10 times t...