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August 29, 2014

August 29, 2014

Posted by **karly** on Tuesday, May 1, 2012 at 2:51pm.

- math -
**visoth**, Tuesday, May 1, 2012 at 4:25pmthsi is how i would do it

lets say equation 1 will be -7x + 5y = -56

and equation 2 is -21x - 2y = -168

nothign can cancel out if you llok at the equation so what i would do is multiply equation 1 by a negative 3 that way the -7x becomes a positive 21x to cancel out(but you have to multpliy everything in the equation by -3 not just the -7x)

so you will have;

21x -15y = 168

now add the two equation together

(21x - 15y= 168) + (-21x - 2y=-168)

notice the x and the total on the right side of equal sign cancels leaving you with :

-17y=o y=0 since 0 dvide by anything is still zero now choose any of your original equation and plug in 0 for y and solve for x

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