Solve system of equations by the addition method.

Algebra
Tutor: None Selected Time limit: 1 Day

2x-6y=8

3x+9y=12

Apr 29th, 2015

-3/2(2x - 6y) = -12

-3x + 9y = -12

3x + 9y = 12

18y = 0 

y = 0

2x - 6(0) = 8

2x = 8

x =4

Apr 29th, 2015

Where did you get the -3/2 from? 


Apr 29th, 2015

I was thinking what number would you have to multiply both sides of the top equation by in order to get -3x so that the x's cancel out and you are left with just y in the equation.

Apr 29th, 2015

Oh I see now. :) 

Apr 29th, 2015

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