Homework Help: Math

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

6x-4y=54
-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 10:25pm
I 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 10:52am
Thank you very much....
equation - jack roger, Wednesday, February 13, 2013 at 9:14am
x + 4y = 54

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