Answer:
y = 38°
Explanation:
y + 91° = 129° (opp. ∠s = ext. ∠)
y = 129° - 91°
In a triangle, the two opposite angles of an angle equals to the exterior angle that is adjacent to that angle on a straight line.
y = 38
exterior angle of a triangle = sum of its interior opposite angles
129 = 91 + y
y = 129 - 91
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