Which fraction represent the given fraction rewritten with their lcd? 1/3x-9y, 6/5x-15y a. 2/8x-21y , 12/8x-21y b. 5(x-3y)/15(x-3y) , 15(x-3y)^2 c. 5/15(x-3y) , 18/15(x-3y) d. 5/15x-135y , 18/15x-135y

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.

C

find y intercepts

y-intercept=7

 y-intercept=-2

graph using the slope

for the first equation it will be shaded above the line and the line will be solid be it is greater than and equal to for the second equation it will also be shaded above the line but the line will be dashed because it is just greater than