Posted by Holly on Saturday, March 13, 2010 at 6:39pm.
Can someone help me solve the following....using elimination methods
1)
5x+7y=43
4x+y=25
2)9x9y=36
7y3x=14

math  Miguel Santos, Saturday, March 13, 2010 at 7:03pm
For 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 7:15pm
would 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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