What is 2x-3y/X-y-X+y

Question

it is a rational expression with unlike denominators

Answer 1

Let's assume that your problem, when written with correct parenthesization, is

(2x-3y) ÷ (x-y) - (x+y). 

 

You simply need to get a common denominator; it's (x-y).

 

To combine the two terms, one of which has no denominator, you need to multiply the last term (by ONE, expressed as (x-y)/(x-y).

 

Then you have a combined numerator 2x-3y - (x+y)(x-y).  From there, you should be able to clean up the new numerator.