Name________________________

 

EVALUATING EXPRESSIONS #1--KEY

 

 

Directions: Evaluate the expressions below when x = 4 and y = 7. That means you should substitute a 4 in place of any xs in the expression and substitute a 7 in place of any ys. 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(11) 42 8 - 3

18 33 31

 

1) xy = ___28___ 2) x + y = ___11___

 

 

 

 

 

3) 2x + 3 = ___11___ 4) 2y - 3 = ___11___

 

 

 

 

 

 

5) 2x + 2y = ___22___ 6) 5(x+y) = ___55___

 

 

 

 

 

 

7) y - 2 = ___5___ 8) 2y 2x = ___6_____

 

 

 

 

 

 

9) 2x + 4x + 11 = ___35_____ 10) 40 3y + x = ___23____