Answer:
Explanation:
measures of complementary angles always add up to 90°
(3y - 1) + (4y + 7) = 90
3y + 4y - 1 + 7 = 90
7y + 6 = 90
7y = 90 - 6
7y = 84
y = 84/7
y = 12
To Calculate the measure of each of the angles replace variable y with 12
3(12) - 1 = 35 degrees
4(12) + 7 = 55 degrees
35 + 55 = 90°