A, B and C lie on a straight line.
Given that angle
y
= 128° and angle
z
= 91°, work out
x
.

Answer:
x = 37°
Step-by-step explanation:
The exterior angle of a triangle is equal to the sum of the 2 opposite interior angles .
y is an exterior angle of the triangle , then
y = x + z , that is
128° = x + 91° ( subtract 91° from both sides )
37° = x
Answer:
x+91+(180-y)=180
180-128=52
x+91+52=180
143+x=180
x=37
Hope This Helps!!!