Question

Solving system of equation using substitution?

-3x - 8y = 20
-5x + y = 19

Answer 1

multiple second equation by 8
-3x-8y=20
-40x+8y=152
sum 2 equations:
-43x+0=172
x=172/-43
x=-4
put x in one of the equations

-3×-4-8y=20
12-8y=20
-8y=20-12
-8y=8
y=-1