Question

For what value of x must ABCD be a parallelogram?

Answer 1

Answer:

x  = 3

Step-by-step explanation:

to be a parallelogram opposite sides have to be equal

so we have

$DC = AB\\\\20x-7 = 16x+5$

now solve for x

$20x-7+7 = 16x+5+7\\\\20x = 16x + 12\\\\20-16x = 16x+12-16x\\\\4x = 12\\\\x = \frac{12}{4} = 3$