SOLUTION: I'm having trouble. I solved for y not x. It was: 2x+y=5 1x-2y=4 I ended up doing this: 2x+y=5 -2x -2x ________ y=5-2x etc. what did i do wrong?

Algebra ->  Coordinate Systems and Linear Equations  -> Lessons -> SOLUTION: I'm having trouble. I solved for y not x. It was: 2x+y=5 1x-2y=4 I ended up doing this: 2x+y=5 -2x -2x ________ y=5-2x etc. what did i do wrong?      Log On


   

Question 273079: I'm having trouble. I solved for y not x. It was:
2x+y=5
1x-2y=4
I ended up doing this:
2x+y=5
-2x -2x
________
y=5-2x
etc. what did i do wrong?
Answer by edjones(8007) About Me  (Show Source):
You can put this solution on YOUR website!
2x+y=5
1x-2y=4
.
4x+2y=10 multiply each side by 2
x-2y=4
--------add
5x=14
x=14/5
.
14/5 -2y = 4
14-10y=20 multiply each side by 5
-10y=6
y=-6/10=-3/5
.
Ed