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

- 7th grade math check -
**MathGuru**, Friday, April 13, 2012 at 7:13pm
Check your solutions with both equations. If your solutions don't fit both, then your answers need to be reworked. For example, using the solution you have for 1):

x = 5

y = -16

5 - (-16) = 11 -->false

-3(5) - 16 = -21 -->false

Solution for this system should be (5,-6).

5 - (-6) = 11 -->true

-3(5) - 6 = -21 -->true

Try the others again.

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