#1
Ok so im subtracting fractions such as this one:

4/y-4 - y/y-4

This is what i got:

4-y/y-4

but the book says the answer is -1.

Im thinking something must be done like factoring so some help please?
#2
Tis the same thing
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#6
if you take the top and multiply by -1, you get -1(4-y)=-(y-4) and -(y-4)/(y-4)=-1

EDIT: Basically you're factoring out a '-1' out of the top.
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#7
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My only guess is add 4 to both sides, giving you -y/y which gives -y. Which I suppose could be -1


it wouldn't work as your dividing by 4
#8
Multiply the top by -1 twice (which is legit, because all you're doing is multiplying it by 1). so it would be like:
-1(y-4)/y-4
Which as you can see, the two cancel, leaving only -1.
Who reads sigs anyway
#10
You can change the denominator to -(4-y). so you get 4-y/-(4-y) which equals -1.
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#11
Quote by Mattman22255577
if you take the top and multiply by -1, you get -1(4-y)=-(y-4) and -(y-4)/(y-4)=-1

EDIT: Basically you're factoring out a '-1' out of the top.


if you multiply it wouldnt you get -4+y?
#13
From What You Got 4-y/y-4 ...opposite Make A -1 Ex. (4-y)/(y-4) Opposite Signs And When You Do That You Get -1....WHAT YOU GOT IS RIGHT BUT YOU PROBALLY HAVE TO SIMPLIYFIE IT
#14
Quote by metaldud536
if you multiply it wouldnt you get -4+y?



Yes and -4+y=y+(-4) (addition is commutative)
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#16
*thumbs up* you said it
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#18
factor out negative one from the bottom, you get (4-y)/[-(-y+4)]
then the top and bottom cancel leaving 1/-1, and that's negative one!
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