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loudav21 · Jul 28, 2008, 04:08 PM

My kid is stuck with this equation can anyone help?
Need the full working:

-12x=3(y-3)

colbtech · Jul 29, 2008, 12:16 AM

Don't normally do homework on this site, but I struggled with this in school. So... in order to simplify (remove the brackets) what you need to do is multiply each term (value) that is inside the brackets by 3. You should end up with 3y (3 multiplied by y) and 9 (3 multiplied by 3) so,

-12x = 3y-9

loudav21 · Jul 29, 2008, 05:34 AM

Originally Posted by colbtech

Don't normally do homework on this site, but I struggled with this in school. So...in order to simplify (remove the brackets) what you need to do is multiply each term (value) that is inside the brackets by 3. You should end up with 3y (3 multiplied by y) and 9 (3 multiplied by 3) so,

-12x = 3y-9

Thanks for your help - it hopefully will make sense now

RPVega · Mar 9, 2011, 02:27 PM

I take it you want the equation in y = mx + b format?
-12x = 3 * (y - 3)= 3y - 9
Add 9 to BOTH sides of the equation:
-12x + 9 = 3y - 9 + 9
The 9's on the right, cancel out:
-12x + 9 = 3y
Divide BOTH sides of the equation by 3:
(-12/3)x + (9/3) = (3/3)y
Simplifying the above:
-4x + 3 = y
or, y = -4x + 3. Good luck!

Unknown008 · Mar 10, 2011, 07:43 AM

RPVega, I'll request you to first of all check the date the question was asked before answering one.

If the question is recent, check now if the question was not already answered.

If you think you are adding something new to the thread, you're welcome to do so, otherwise, refrain form doing so please. Thank you.