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March 31, 2015

March 31, 2015

Posted by **Holly** on Saturday, March 13, 2010 at 6:39pm.

1)

5x+7y=43

-4x+y=25

2)9x-9y=36

7y-3x=-14

- math -
**Miguel Santos**, Saturday, March 13, 2010 at 7:03pmFor 1), just muttiply the bottom one by -7 throughout to get 28x+-7y=-175. 7 and -7 add to 0, so you have gotten rid of the y's. 31x=-132 divide both sides to get what your x is and then use that x to go back and find y.

For 2) the best first move to make is multiply through by 3 on the bottom because then you get 21y + -9x = -42. Positive and negative 9 x add up to zero. All you have to deal with now are the y's. 12 y= -6 divide both sides and now you have a y with which to find x.

- math -
**Holly**, Saturday, March 13, 2010 at 7:15pmwould the answer to number 1 be

(-4.26,1.52)?

would the answer to number 2 be

(-0.5,-6.5)?

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