which method do i use to solve: elimination or substitution

Algebra
Tutor: None Selected Time limit: 1 Day

y=-x

6x+6y=0

Oct 5th, 2014

I use substitution because you have y=-x

But if you notice, 

6y = -6x

  y = -x

The two equations represent lines that are parallel because they have the same slope, so the system doesn't have solution because the lines will never meet.

Oct 5th, 2014

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