### Home > CCA > Chapter A > Lesson A.1.1 > ProblemA-10

A-10.

The word “evaluate” has many different meanings. In algebra, when you are asked to evaluate an expression for a specified value of the variable(s), you are being asked to find the value of the expression. You do this by replacing a variable with a number and calculating the result. For example, if you are asked to evaluate the expression $4x−2$ when$x=−7$, you would put $-7$ in place of the variable and then calculate: $4·(−7)−2=−30$.

Evaluate the expressions below for the given values of x and y.

Rewrite the expression with the number in place of the variable and simplify if possible.

1. $\frac{6}{x}+9\text{ if }x=3$

$\frac{6}{(3)}+9=2+9$

11

1. $8x − 3 + y \text{ if } x = 2 \text{ and } y = 1$

8(2) − 3 + (1)

1. $2xy \text{ if } x = 5 \text{ and } y = −3$

2(5)(−3) = 10(−3)

−30

1. $2x^2−y\text{ if }x=3\text{ and }y=8$

2(3)2 − (8)