SOLUTION: solve by substitution method y = -4x - 7 y = 3x

Algebra ->  Expressions-with-variables -> SOLUTION: solve by substitution method y = -4x - 7 y = 3x       Log On


   

Question 319308: solve by substitution method

y = -4x - 7
y = 3x
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!

1.y+=+-4x+-+7
2.y+=+3x
Substitute eq. 2 into eq. 1,
3x=-4x-7
7x=-7
highlight%28+x=-1%29
Now use eq. 2,
y=3%28-1%29
highlight%28+y=-3%29