Describe and correct the error made in solving the system of equations by elimination

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sashacaballero sashacaballero

22-09-2017
Mathematics

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Describe and correct the error made in solving the system of equations by elimination

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texaschic101 texaschic101 · Answer 1 · 2017-09-22T04:57:11+02:00

texaschic101 texaschic101

22-09-2017

the mistake was when she multiplied the 2nd equation by 5, she forgot to also multiply that last number 10 by 5 as well.

correction :
5x + 3y - z = 15
-x + 2y + 3z = 10...multiply by 5
---------------------
5x + 3y - z = 15
-5x + 10y + 15z = 50 (result of multiplying by 5)
--------------------add
13y + 14z = 65

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