I came out with the right answer, but did I work this out correctly?

-7y = 0

-7y/-7 = 0/-7

-y = 0

-y/-y = 0/-y

y=0

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- March 3rd 2006, 06:23 AM #1

- March 3rd 2006, 07:45 AM #2

- March 3rd 2006, 08:23 AM #3

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- March 4th 2006, 07:45 AM #4

- March 4th 2006, 05:42 PM #5

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you could either divide by -1, multiply by -1, the effect is the same. you don't tend to think of it as "multiplying/dividing by -1" though. you just change the sign of both sides. for instance if

then

you are simply changing the sign of both sides. you don't really need to explain yourself when doing that

likewise if you had

then changing the signs of each side gives:

however multiplying through by -1 is a more common way of thinking about it than dividing through by -1.

- March 5th 2006, 03:50 AM #6Originally Posted by
**Aradesh**

-Dan