SOLUTION: 7x+9y=21 3x-9y= -81

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Question 473197: 7x+9y=21
3x-9y= -81
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
7x+9y=21
3x-9y= -81
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10x+0y=-60

10x=-60
x=-60/10
x=-6

3x-9y=-81
3(-6)-9y=-81
-18-9y=-81
-9y=-81+18
-9y=-63
y=-63/(-9)
y=7

Answers: x=-6 and y=7