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m1 X m2 = -1? Find m2 Watch

1. If m2 = 2/5

m1 X 2/5 = -1
is the answer -2/5 or -5/2?

And also

If AB = 6/7

Ml (MAB) = -1
Ml = -6/7 or -7/6?
2. for the first one its
-5/2

3. (Original post by ameelia22)
for the first one its
-5/2

Thanks, never mind the 2nd q. Just wanted to know if I have to flip the fraction when moving to the other side.
4. (Original post by strangepath)
Thanks, never mind the 2nd q. Just wanted to know if I have to flip the fraction when moving to the other side.
-1 / (2/5)

is the same as -1 x 5/2
5. I'd just work this out by

-1 / (2 / 5 ) = -2.5, Which is -5/2

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Updated: April 5, 2013
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