SOLUTION: Solve the systems by the addition method 2) 3x + 9y = 15 –x + 5y = 3

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Question 314184: Solve the systems by the addition method
2) 3x + 9y = 15
–x + 5y = 3
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
1.3x+%2B+9y+=+15
2.-x+%2B+5y+=+3
Multiply eq.2 by 3 and add to eq. 1,
3x+%2B+9y+-3x+%2B15y+=+15%2B9
24y=24
highlight%28y=1%29
Then use either equation to solve for x.
-x%2B5y=3
-x%2B5=3
-x=-2
highlight%28x=2%29