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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