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December 20, 2014

December 20, 2014

Posted by **Team A** on Tuesday, September 14, 2010 at 7:46pm.

7x+6y=15 and -7x+y=27. Thanks

- Algebra -
**MathMate**, Tuesday, September 14, 2010 at 8:48pmIt takes work to find the answers, but it is much easier to check a given answer, namely by back-substitution. This is especially important in exams where you can check and reassure yourself you have the right answer.

for

7x+6y=15...(1)

-7x+y=27...(2)

add (1) and (2) to get

7y=42

Solve for y and substitute y in (1) to get x=-3.

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