Posted by **Serena** on Thursday, January 24, 2008 at 5:53pm.

How to solve this problem.

3X-Y=12

- 4th grade Algebra -
**renee**, Thursday, January 24, 2008 at 5:55pm
minus 3x to both sides

-Y=12-3X. THEN DIVIDE BY -1 TO BOTH SIDES

SO Y=-12+3X

- 4th grade Algebra -
**Damon**, Thursday, January 24, 2008 at 5:59pm
3X-Y=12

I think probably you are supposed to get +y alone on the left

first add -3x to both sides

-3x + 3x - y = -3x + 12

or

-y = -3x + 12

but we want +y, not - y

So multiply every term on both sides by -1

(-1)(-y) = (-1)(-3x) + (-1)(12)

or

y = 3x - 12

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