Question

Which is the value of x?

a. x=3
b. x=6.5
c. x=8.5
d. x=14

Answer 1

x = 14

Explanation:

The angles form a straight line which makes them add to 180 degrees

4x+ 8x+12 =180

Combine like terms

12x+12 =180

Subtract 12 from each side

12x+12-12 = 180-12

12x=168

Divide each side by 12

12x/12 =168/12

x =14