Answer:
x = 4 , x = 3
Step-by-step explanation:
The exterior angle of a triangle is equal to the sum of the 2 opposite interior angles.
(11)
18x + 5 = 46 - 1 + 8x
18x + 5 = 45 + 8x ( subtract 8x from both sides )
10x + 5 = 45 ( subtract 5 from both sides )
10x = 40 ( divide both sides by 10 )
x = 4
(13)
15x + 5 + 22x + 4 = 120
37x + 9 = 120 ( subtract 9 from both sides )
37x = 111 ( divide both sides by 37 )
x = 3
