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System of linear equations

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Please advise. My son is preparing for his jr. high algebra I finals and he is having problems with the following problems:

solve using addition or subtraction elimination.

-3y + 4y = 15

3x + 6y = 5

solve using multiplication elimination
4x - y = 12

-3 + y = 6.

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Solution Summary

The solution provides step-by-step method for the calculation of roots of a system of linear equations using addition, subtraction or multiplication elimination method.

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Please see the attachment.

1. Solve using addition or subtraction elimination.

-3x + 4y = 15

3x + 6y = 5
Answer
The given equations are
-3x + 4y = 15 ------------------ (1)
3x + 6y = 5 -------------------- (2)
Adding equations (1) and (2), we get,
10y = 20 (Note that the x variable is eliminated)
Therefore, y = ...

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