Respuesta :

Answer:

Step-by-step explanation:

(21 + 3y) + y = 90

21 + 4y = 90

4y = 69

y = 17.25

x = 21 + 3(17.25)

x = 21 + 51.75

x = 72.75

Answer check:

72.75 + 17.25 = 90

90 = 90 Corrrrrrect !

FancyBun
Answer: x = 72.75 and y = 17.25

Explanation:

x = 3y + 21

And x + y = 90° (complementary angle)

Substitute x value in the equation:

3y + 21 + y = 90
4y + 21 = 90
4y = 69
y = 69/4
y = 17.25

x = 3(17.25) + 21
x = 51.75 + 21
x = 72.75