Answer:
A=73
B=17
Explanation:
From above, you can see that A+B=90
So I can add my two angles together and have it equal to 90
( 5 x + 8 ) + ( x + 4 ) = 90
5 x + 8 + x + 4=90
6 x + 12 = 90
6 x = 90 − 12
6 x = 78
x = 13
So A = 5 x + 8=5 ( 13 ) + 8 = 65 + 8 = 73
and B = x + 4 = 13 + 4 = 17
Just to make sure you are correct, add your A and B together and they should equal to 90
A + B = 73 + 17 = 90
Hope This Helps You :)