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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. 6/x + 9 if x = 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.