Question

Which expressions are equal to 4 when x = 7 and y = 2?

Choose all answers that are correct.

A.
x – y – 1

B.
x – (6 ÷ y)

C.
xy – 8

D.
x + y – 4

Answer 1

A. x-y-1, B. x-(6/y) and C. xy-8

A. 7-2=5
5-1=4

B.7-(6/2)
order of operations
parentheses
6/2=3
7-3=4

C. 7(2)-8
7(2)=14
14-8=4

Not D, because
7+2-4
7+2=9
9-4=5