SOLUTION: My directions are to solve the system by substitution. I don't know what I did wrong, but when I went to recheck my work I did not come up with the right answer could someone pleas

Question 82113: My directions are to solve the system by substitution. I don't know what I did wrong, but when I went to recheck my work I did not come up with the right answer could someone please re-work this problem and tell me what I did wrong.
3x+3y=9
y=2x-12
My work
3x+3(2x-12)=9 y=2(50
3x+6x-36=9 =10-12
9x/9=45/9 = -2
x=5
(5,-2)
To Check
5+ -2=7
7+ -2=9
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
3x+3y=9
y=2x-12
------------
You have x=5, y=-2
Check:
3(5)+3(-2)=9
15-6=9
9=9
-------
or
-2=2(5)-12
-2=10-12
-2=-2
============
Cheers,
Stan H.
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