Question

1. Which expression has a value of 30 when x = -1 and y = 3? A. (x - 3^2) · y - 6 B. (x - 3^2) · (y - 6) C. x - 3^2 · (y - 6) D. x - 3^2 · y - 6

Answer 1

B. (x - 3²)(y-6)

Explanation:

Find the expression with a value of 30;

when x = -1 and y = 3:

A. (x - 3²).y-6

(-1 - 9).3-6 = -10 x 3 -6 = -30 - 6 = -36

B. (x - 3²)(y-6)

( -1 -3²)(3 - 6) = (-1 -9)(-3) = 30

C. x - 3² . (y-6) = -1 - 9.(3-6)

= -1-9.-3

= -1 - 9 x -3

= -1 + 27

= 26

D. x - 3².y-6 = -1 - 9. 3 - 6

= -1 - 27 - 6

= -34