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Alissa G.

asked • 10/22/16

solve question by elimination

a+b+c=-3

3b-c=4

2a-b-2c=-5

Ismael A.

There is an error on equation 4) given by Marlene S. Correct equation 4) on her explanation should be -2a-2b-2c=-6
You can quickly check with a calculator that the final solution is not correct. Considering just c in the final solution, the correct value is c=7/5
 
 
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10/22/16

Ismael A.

I take back prior comment. The solution by Marlene S is correct.
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10/22/16

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