If & angle; A and & angle; B are supplementary and & angle; A = 4x - 8 and & angle; B = 2x + 2, what is the value of x?

Set them equal together. 4x-8=2x+2. Subtract 2x on both sides. 2x-8=2. Add 8 on both sides. 2x=10. Divide 2 on both sides x=5. Check answer!

4 (5) - 8=12

2 (5) + 2=12

12=12

So answer is x=5!