Question

Hello, I need help solving the system of equations by substitution method.

Answer 1

4x + 2y = 108
x = -5y

4(-5y) + 2y = 108
-20y + 2y = 108
-18x = 108
 -18     -18
     x = 6
4(6) + 2y = 108
  24 + 2y = 108
- 24           - 24
           2y = 84
            2      2
             y = 41
        (x, y) = (6, 41)

Answer 2

4(-5y) + 2y = 180

-20y + 2y = 180

-18y = 180

y = -10
x = 50