Find the measure of the exterior angle.

x + 180- 4x = 90

-3x = -90

  x = 30

the exterior angle = 4(30) = 120

Answer

120 degrees

step-by-step explanation:

step 1: solve one of the equations for one of the variables. let's solve the first equation for y:

step 2: substitute that equation into the other equation, and solve for x.

step 3: substitute x = 4 x = 4 x=4 into one of the original equations, and solve for y.