x-5y=-21

Question

9y-8x=44
substitution method

Answer 1

x-5y=-21
9y-8x=44

x = 5y - 21

9y - 8(5y - 21) = 44
9y - 40y + 168 = 44
-31y = 44 - 168
-31y = -124
y = 4

Take it from there.

Answer 2

x = 5y -21

9y-8(5y-21) = 44

9y -40y +168 = 44

-31y + 168 = 44

-31y + 168 -168 = 44 -168

-31y = -124

y = 4

x = 5(4)-21 = -1

(-1, 4)