SOLUTION: 2x-4y=6 2x+y=1 my teacher said to solve this by using substitution but i keep getting the worng answer, help plz :)!

Question 258778: 2x-4y=6
2x+y=1

my teacher said to solve this by using substitution but i keep getting the worng answer, help plz :)!
Found 2 solutions by Fombitz, richwmiller:
Answer by Fombitz(32388) (Show Source): You can put this solution on YOUR website!
1.
2.
Since both have a "2x" term solve eq. 1 for 2x and substitute into eq. 2,
1.

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2.

Then from above,

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(x,y)=(1,-1)
Answer by richwmiller(17219) (Show Source): You can put this solution on YOUR website!
So what did you try?
What did you get?

2x-4y=6
2x+y=1
Substitution might be the harder way to solve this
Elimination would be
Subtract the two and get
-5y=5
y=-1
2x-1=1
2x=2
x=1
However we will do it by substitution.
Solve the second for y
y=1-2x
Substitute 1-2x for y in the first
2x-4(1-2x)=6
2x-4+8x=6
10x =10
x=1
y=1-2(1)
y=1-2
y=-1
Same answers
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