Find the value of x that makes A || B.

Answer:
x=15
Step-by-step explanation:
angle 2 and angle 4 are same side interior angles. same side interior angles are supplementary angles or angles that add up to 180°
2x+10+4x+80=180
6x+90=180
-90 -90
6x=90
6x/6=90/6
x=15
hopefully this helps :)