Answer:
x = 2
z = 93°
Step-by-step explanation:
set the top and bottom equations equal to each other...
5x + 77 = 9x + 69, solve for x...
subtract 69 and 5x from both sides...
8 = 4x
divide both sides by 4...
x = 2
substitute 2 for x in either equation...
5(2) + 77 = 87°
subtract 87 from 180...
180° - 87° = 93°
z = 93°
