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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