SOLUTION: Solve system by substitution method. 3x-4y=x-y+4 2x+6y=5y-4 I've been trying to figure this one out for about an hour on scratch paper.

Algebra ->  Linear-equations -> SOLUTION: Solve system by substitution method. 3x-4y=x-y+4 2x+6y=5y-4 I've been trying to figure this one out for about an hour on scratch paper.       Log On


   

Question 100807This question is from textbook Intro Alg
: Solve system by substitution method.
3x-4y=x-y+4
2x+6y=5y-4
I've been trying to figure this one out for about an hour on scratch paper.
This question is from textbook Intro Alg

Answer by scott8148(6628) About Me  (Show Source):
You can put this solution on YOUR website!
if you get the x and y on opposite sides in the first equation it gives 2x=3y+4

substituting this into the second equation gives (3y+4)+6y=5y-4 ... 4y=-8 ... y=-2

2x=3(-2)+4 ... 2x=-2 ...x=-1