Answer:
y = 43
Explanation:
Given AB is a straight line segment, and since angles on a straight line sum to 180°, we can construct the following equation:
⇒ 47° + y° + 90° = 180°
To find the value of y, solve the equation for y:
⇒ 137° + y° = 180°
⇒ 137° + y° - 137° = 180° - 137°
⇒ y° = 43°
⇒ y = 43
Therefore, the value of y is 43.