After multiplying each side of the equation by the lcd and simplify , the resulting equation is

Justification:

1) The LCD is    

2) The fraction of the left side times the LCD is:



3) the first fraction of the right side times the LCD is:



4) the second fraction of the right side times the LCD is:



5) That leads to:



6) transposing terms to the left and combining like terms:

$7.50x+$4.50y=midk it's been awhile since i've done one of these

The answer is that the rate of change is $50 per 1 monthhope this ; )