The measure of an angle is 4y°. Find the measure of its supplement.
Responses
A (180 + 4y)°(180 + 4y)°
B (180 - 4y)°(180 - 4y)°
C (90 + 4y)°(90 + 4y)°
D (90 - 4y)°
The measure of an angle and its supplement add up to 180° by definition. Therefore, the measure of the supplement of an angle measuring 4y° is (180 - 4y)°.
So, the correct answer is option B.