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September 1, 2015

Homework Help: 7th grade math check

Posted by saranghae12 on Thursday, April 12, 2012 at 9:11pm.

Ok I was wondering if you could check these 3 problems please. I am suppose to set these equations equal but I am not sure if did them right. I think I accidently solved these systems as substitutions. The answers are suppose to be in coordinate pairs.


1) x - y = 11
-3x + y = -21
I got (5,-16)

2) 5x - 4y = 17
-10x + 4y = -42
I got (5,3)

3) x + 3y = -1
3x + 3y = 15
I got (4,1)

Please check if i did it correctly please. thank you

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