Homework Help: Algebra

Posted by jessica on Wednesday, May 9, 2007 at 1:02am.

Can someone please help solve this?
Solve by using addition or substitution or addition.

10x+2y=7
y=-5x+3

the answer my got was x=11/10
y=-2

My teacher said that was wrong.

Never mind this post I found out how to solve it.

Try substitution.
10 x + 2(-5x +3) = 7
That leads to 6=7, which cannot be true.
Therefore the two equations are inconsistent and there is no solution. Another way to look at it is to say the equations are for two parallel lines that never intersect.

2y=7-10x
y=3-5x

(2y=7-10x) mulitipy by 3
(y=3-5x) multiply by -6

6y=21-30x
-6y=-18+30x
0/-/3 doesnt workkk

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