SOLUTION: Solve this system of equations by the substitution method. x+4x=-1 3x+y=8

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Question 314763: Solve this system of equations by the substitution method.

x+4x=-1
3x+y=8
Answer by Jstrasner(112) About Me  (Show Source):
You can put this solution on YOUR website!
Hey,
So for this one, we simply solve the first one:
x+4x=-1 => 5x=-1 => x=-1/5
then we substitute this into the next equation:
3(-1/5) + y = 8
And solve for this one:
-3/5 + y = 8 => y= 43/5
I hope this helps!