algebra
posted by Alicia .
explain how you solve 11x=3y=12 using 3x=9 as subsitution

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 = 1233
3y = 21
y = 7
x = 3 , y = 7 
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