Posted by **Jordaine** on Wednesday, September 19, 2012 at 10:39pm.

Solve each system of equations using substitution.

1.) x+3y=-4

y+x=0

2.) y=2x+3

5x-y=-3

3.) 2y=-4x

4x+2=-11

- Math -
**Steve**, Thursday, September 20, 2012 at 10:51am
Since these are all similar, I'll do one and you can come on back if you get stuck or just want confirmation of your answers.

#2:

y=2x+3

5x-y=-3

from the first equation,

y = 2x+3

Now substitute that into the second equation:

5x - (2x+3) = -3

3x - 3 = -3

3x = 0

x = 0

so, y = 3

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