Question

Help me out please!!
For what value of X must ABCD be a parallelogram?

Answer 1

x = 3

Explanation:

A parallelogram must have two pairs of parallel sides.

For this to be true, the alternate exterior angles of the diagonal must be congruent.

Hence the equation,

10x + 4 = 13x - 5

Simplify.

9 = 3x

x = 3