Question

For what value of x is line a parallel to line b (4x+72) (2x-12)

Answer 1

x = 20

Explanation:

To make a // b ⇒ The angles (4x+72) and (2x-12) are supplementary angles.

So, (4x + 72) + (2x - 12) = 180°

Combine like terms

6x + 60 = 180

6x = 180 - 60

6x = 120

x = 120/6 = 20

∴ x = 20