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September 19, 2014

September 19, 2014

Posted by **Linda** on Thursday, August 27, 2009 at 12:56am.

2.Given that: 4x-y+9=0 and 3y-2x=7, solve for x.

- Math -
**Jordan**, Thursday, August 27, 2009 at 5:06amI'll answer 2.

to get rid of the y's we make this a simultaneous equation

(1)4x-y=-9

(2)3Y-2X=7

the number of y's must be equal so that they will cancel eachother out when we add them together

so 3*(1)=12x-3y=-27

then we do (1)+(2)

12x-3y+3y-2x=-27+7

hopefully you will see that the y's cancel eachother out and we are left with

10x=-20

therefor x=-2

if you are unsure with any of the steps feel free to ask :)

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