Question

For what value of x must ABCD be a parallelogram? asap please!!

Answer 1

parallelogram so
CD = AB
18x - 5 = 15x + 4
3x = 9
x = 3

answer
x = 3

Answer 2

x = 3

Explanation:

In a parallelogram, opposite sides have the same length. Then:

segment DC = segment AB

and

segment DA = segment CB

Replacing with data from the picture, we get:

18*x - 5 = 15*x + 4

18*x - 15*x = 4 + 5

3*x = 9

x = 9/3

x = 3