Answer:
y = 55 , y = 100
Explanation:
9
the sum of the 3 angles in a triangle is 180°
sum the angles and equate to 180
y + 75 + 50 = 180
y + 125 = 180 ( subtract 125 from both sides )
y = 55
10
the sum of the exterior angles of a triangle is 360°
sum the exterior angles and equate to 360
y + 120 + 140 = 360
y + 260 = 360 ( subtract 260 from both sides )
y = 100