# Evaluating algebraic expressions

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##### Intros
###### Lessons
1. i) What are variables?

ii) What is an expression?

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##### Examples
###### Lessons
1. Below we have used ponds and tadpoles to model an expression. Write the expression and use the variable x to represent the unknown number of tadpoles in each pond.

2. Mary bought $s$ packages of stickers, and there are 10 stickers in each package. Write an expression to show how many stickers Mary bought.
1. Write an expression for each phrase. Then, evaluate the expression.
1. 10 pounds lighter than Molly (m), when m=100
2. 22 years older than Tracy (t), when t = 10.
3. 17 less than 5 times a number (n), when n = 7
2. Evaluate the following expression, if $x = 7$ and $y = 9$
1. $6x-y+5$
2. $\frac{2}{3}x+\frac{1}{6}y-1$
3. $0.5x-0.1+1.3y$
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