Question

Find the value of x that will make a||b

Answer 1

The location of each angle make them vertical angles. For the lines to be parallel the two angles need to be equal to each other.

5x + 20 = 3x + 60

Subtract 3x from both sides:

2x + 20 = 60

Subtract 20 from both sides:

2x = 40

Divide both sides by 2:

X = 20