Question 494737
8x + 13 + x + 14 = 90
9x + 27 = 90
9x = 63
x = 7 degrees.
56 + 13 = 69 degrees, angle a.
7 + 14  = 21 degrees, angle b.
69 + 21= 90 degrees.
This does check.
Celomenius.