### Home > CAAC > Chapter 2 > Lesson 2.1.1 > Problem2-10

2-10.
1. 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 ✎

1. + 9 if x = 3

2. 8x − 3 y if x = 2 and y = 1

3. 2xy if x = 5 and y = −3

4. 2x2y if x = 3 and y = 8

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

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

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

11

8(2) − 3 + (1)

Try evaluating this one on your own. Think of the rules for multiplying positive and negative integers.

2(5)(−3) = 10(−3)

−30

2(3)2 − (8)