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April 24, 2014

Homework Help: Math

Posted by Katie Lee on Thursday, September 15, 2011 at 11:42pm.

5x+3y=-11, 7x-2y=19 solve by elimination.
Sol'n:
5x+3y = -11 ---(1)x 2, 10x + 6y = -22 ----(1')
7x-2y = 19 ---(2)x 3, 21x - 6y = 57 ----(2')
add 1' and 2'
31x = 55, divide by 31 on both side to obtain the value of x,
x = 35/31
then find y: from (2)
7(35/31) - 19 = 2y
2y = -344/31, then divide by 2 on both side to obtain the value of y.
y = -172/31
thus
x = 35/31 and y = -172/31 <----- answer
How do you get -344/31 in this problem?

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