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Mathematics 8 Online
OpenStudy (anonymous):

What is the simplified form of.... (I have a picture to show the example)

OpenStudy (anonymous):

OpenStudy (lgbasallote):

you'll want to put the numerator in a single denominator (by LCD)..same with denominator...first

OpenStudy (anonymous):

wait what?

OpenStudy (anonymous):

1/xy? like that?

OpenStudy (lgbasallote):

well not exactly... let me give a demonstration.. \[\frac ax + \frac by\] first multiply the denominators this gives you xy <--this becomes the denominator then multiply the denominator of the second fraction to the numerator ofthe first fraction <--that gives you ay then multiply the denominator of the first fraction to the numerator of the second fraction <--that gives you bx so \[\frac ax + \frac by \implies \frac{ay + bx}{xy}\] does that make sense?

OpenStudy (anonymous):

sorta. so then it becomes x+y/xy?

OpenStudy (lgbasallote):

yup

OpenStudy (lgbasallote):

what about the denominator \[\frac 1y - \frac 1x\]

OpenStudy (anonymous):

y-x/yx?

OpenStudy (anonymous):

or wouldnt it be xy on the denominator because x goes first? Since its before in alphabetical order?

OpenStudy (lgbasallote):

xy and yx are the same

OpenStudy (lgbasallote):

commutative property ofmultiplication

OpenStudy (anonymous):

ohh got it! so how do i finish this? my answer choices are this..

OpenStudy (lgbasallote):

so... the expression becomes \[\Large \frac{\frac{x+y}{xy}}{\frac{y-x}{xy}}\] do you see anything that can be cancelled?

OpenStudy (anonymous):

umm yeah the denominators?

OpenStudy (anonymous):

So its x+y/y-x?

OpenStudy (lgbasallote):

yup

OpenStudy (anonymous):

wait thats not an answer choice :/

OpenStudy (anonymous):

y+x/y-x y-x/y+x x-y/x+y x+y/x-y

OpenStudy (lgbasallote):

lol wait.. i saw your mistake...

OpenStudy (anonymous):

haha okay

OpenStudy (lgbasallote):

\[\frac 1y - \frac 1x\]this should be \[\frac{x - y}{yx}\]

OpenStudy (lgbasallote):

so the fraction would be \[\Large \implies \frac{\frac{x+y}{xy}}{\frac{x-y}{xy}}\]

OpenStudy (anonymous):

ohh! I reversed them!

OpenStudy (anonymous):

x+y/x-y?

OpenStudy (lgbasallote):

yes

OpenStudy (anonymous):

thankyou so much!

OpenStudy (lgbasallote):

welcome

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