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

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 4*x*− 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 ✎+ 9 if

*x*= 38

*x*− 3*y*if*x*= 2 and*y*= 12

*xy*if*x*= 5 and*y*= −32

*x*^{2}−*y*if*x*= 3 and*y*= 8

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

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)

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