Multiply equation 2 by 3 to get rid of the fraction
9x + y = 54 then multiply row 1 by -1 and add it to this
-6x - y = -24
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3x = 30 so x = 10
then plug that in to get y

Positive: 62.5 %

Answer #2 | 28/12 2013 20:38

6x + y = 24 and and 3x+y/3=18
Another way to do it is to look at the first equation. 6x + y = 24
You can change it to y=24-x
Then put that into the second equation for Y. Solve for X, and resolve for Y.

Positive: 50 %

Answer #3 | 29/12 2013 17:39

6x + y = 24
y = -6x + 24
3x + (-6x + 24)/3 = 18
3x - 2x + 8 = 18
x + 8 = 18
x = 10
y = -60 + 24
y = -36

Answer #1| 28/12 2013 19:1262.5 %