Question

Solve the systems using substitution.
3x + 2y = -4
x + 2y = -8

Answer 1

x + 2y = -8
x = -8 - 2y
3( -8 - 2 y) + 2y = -4

-24 - 6y +2y = -4
-24 - 4y = -4
-4y = 20
y = -5
x = 2

Answer 2

equation 1 : 3x + 2y = -4
equation 2 : x + 2y = -8 -> x = -2y -8

Let's plugin -2y-8 to first equation's x;

3(-2y-8) + 2y = -4
-6y - 24 + 2y = -4
-4y = 24-4
y= 20/ -4
y= -5

Plugin -5 to second equation's y;
x = -2y -8
x=-2(-5)-8
x=10-8
x=2

Hope it helps.