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.

## Answer this Question

## Related Questions

- Math (Check) - The equation y = a^x is a decreasing function a = 1) 1 2) 2 3) -3...
- 7th grade math - Can you check these problems? 1. 4x^2 + 3x - 4x +5 = 4x^2 - x...
- MAT 7th GRADE - Please help. Will someone please check the answer to these ...
- grade 9 math slope equations - question: slove by comparison and check your ...
- third grade math - how do you check addition problems by adding up? Let's use ...
- MATH 7th GRADE - Would someone please be kind enough to check the answers for ...
- 7th grade Math - can someone please check this for me. Be sure to round to the ...
- Pre Cal Check - focus: (0,p) vertex: if not given, then it is assumed (0,0) ...
- 8th grade math - I am not sure if I did it correct, can you please check this ...
- Precalculus problems check? - Did I do these two problems right? P(1-sqrt2) = 8x...