SOLUTION: Solve this system using the elimination method. -2x - y = -7 and x + 7y = 10

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Question 1204012: Solve this system using the elimination method.
-2x - y = -7
and
x + 7y = 10
Answer by MathLover1(20850) About Me  (Show Source):
You can put this solution on YOUR website!

-2x+-+y+=+-7....eq.1
x+%2B+7y+=+10.....eq.2....both sides multiply by 2
________________________________
-2x+-+y+=+-7....eq.1
2x+%2B+14y+=+20.....eq.2
_____________________________________add both eq.
-2x+-+y+%2B2x+%2B+14y+=+-7%2B20....eq.1
13y+=+13
y+=+1

go to
2x+%2B+14y+=+20.....eq.2, substitute y
2x+%2B+14%2A1+=+20
2x+%2B+14+=+20
2x+=+20-14
2x+=+6
x+=+3


+graph%28600%2C+600%2C+-10%2C+10%2C+-10%2C+10%2C+-2x+%2B7%2C++10%2F7+-+x%2F7%29+