SOLUTION: I have this math problem but can't find the steps 9a+6b=-9 -9+b=30

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Question 862677: I have this math problem but can't find the steps
9a+6b=-9
-9+b=30
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
I made the correction below with what I think you meant.
9a%2B6b=-9
-9a%2Bb=30
Add the equations together.
9a%2B6b-9a%2Bb=-9%2B30
7b=21
b=3
Then use either equation to solve for a
9a%2B18=-9
9a=-27
a=-3