Posted by Alicia on Thursday, February 14, 2013 at 10:20pm.
I have a feeling you meant:
11x + 3y = 12 (the + and = are the same key)
for 3x = 9 ---> x = 3
then ...
11(3) + 3y = 12
3y = 12-33
3y = -21
y = -7
x = 3 , y = -7
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