Question

In parallelogram WXYZ, what is CY? CY=___ ft

Answer 1

The correct answer is 11 ft.

Explanation:
The diagonals of a parallelogram bisect each other. This means that the portion marked x+4 is the same length as the portion marked 2x-7; this gives us the equation x+4=2x-7.

Subtract x from each side:
x+4-x=2x-7-x
4=x-7.

Add 7 to both sides:
4+7=x-7+7
11=x

Answer 2

You forgot to put the 11 into the equation for CY:  2(11) - 7 = 15