### Home > CC3 > Chapter 2 > Lesson 2.1.1 > Problem2-9

2-9.

One meaning of the word evaluate is to find the value of an expression. To evaluate, replace a variable with a number and calculate the result. For example, when you are asked to evaluate the expression 4x − 2 when x = −7, you would put −7 in place of the variable and calculate: 4 · (−7) − 2 = −30.

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

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

1. + 9 if x = 3

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

$\text{Remember }\frac{6}{3} \text{ is the same as }6 \text{ divided by }3.$

11

1. 8x − 3 + y if x = 2 and y = 1

8(2) − 3 + (1)

Try evaluating this one on your own.

1. 2xy if x = 5 and y = −3

2(5)(−3) = 10(−3)

−30

1. 2x2y if x = 3 and y = 8

2(3)2 − (8)

Try evaluating this one on your own. You have been given a head start.