Math
posted by Jordaine .
Solve each system of equations using substitution.
1.) x+3y=4
y+x=0
2.) y=2x+3
5xy=3
3.) 2y=4x
4x+2=11

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
5xy=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