Question

Which fraction represent the given fraction rewritten with their LCD?

Answer 1

Please, use ( ) around fractional coefficients:

1/3x-9y, 6/5x-15y  should (probably) be written as (1/3) - 9y and (6/5)x - 15 y.

The LCD here is 3(5) = 15.


Mult. 1/3x-9y and 6/5x-15y by 15, and then divide the result by 15:

15 [ (1/3)x - 9y and (6/5)x - 15 y ]
---------------------------------------------
                     15


This simplifies to:

5x - 135y  and   18x - 225y
------------            --------------
       15                     15

These fractions are equivalent to the original ones, but now the common denominator, 15, is evident.