Algebra check+help?

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For problems 1 and 2 write Y as a function of X

1) 12=9x+3y
- I think you would subtract 9 from the 12.. but I'm not really sure because you can't add/subtract x's and y's from regular numbers.

2) -2x+3y=9
Same problem as above..
Can someone please explain to me how to do these problems?!
Thank you.

-Allyson

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