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February 28, 2015

February 28, 2015

Posted by **Deborah** on Sunday, December 2, 2012 at 9:36pm.

-9x+2y=-69

Which system would work best to solve?

Please show work and solve. (all steps)

Thank You

I honestly don't know how to do this.

- Math -
**Reiny**, Sunday, December 2, 2012 at 10:25pmI would use elimination, where we attempt to get the coefficients of either x or y to be the same or to be opposite

1st equation --> 6x - 4y = 54

2nd times 2 --> -18x + 4y = -138

add them:

-12x = -84

divide by -12

x = 7

sub back into the first

6(7) - 4y = 54

-4y = 12

y = -3

x = 7, y = -3

sub those values into both equations to verify that my answer is correct (it works !)

- Math -
**Deborah**, Monday, December 3, 2012 at 10:52amThank you very much....

- equation -
**jack roger**, Wednesday, February 13, 2013 at 9:14amx + 4y = 54

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