Name________________________

EVALUATING EXPRESSIONS #2--KEY

Directions:  Evaluate the expressions below when x = -4 and y = 7.  That means you should substitute a 4 in place of any x’s in the expression and substitute a 7 in place of any y’s.  After that, follow the standard order of operations to find the value of the expression.  Write that value in the space provided.

Examples:        x + 2y                                      3(x + y)                       6y + 2x + 3

-4 + 2(7)                                   3 (-4 + 7)                  6(7) + 2(-4) + 3

-4 + 14                                     3(3)                             42 + (-8) + 3

10                                             9                                    37

1)     xy =                    ___-28___                                                       2)     x + y =             ___3___

3)     5x + 3 =             ___-17___                                                        4)     2y - 8 =            ___6___

5)     2x + 2y =           ___6___                                                           6)     4(x+y) =           ___12___

7)     -y + 2 =                ___-5___                                                        8)     2y + 2x =         ___6_____

9)     2x + 4x + 11 =   ___-13_____                                                  10)     40 – 3y + -x =    ___23____