Suppose 5x-y=15. What is the value of 3x-3/5y

Answer 1

5x - y = 15

5x -15 = y

solve for y, then plug in that value into 3x-3/5y

= 3x -3/(5x-15)

or solve for x and plug that value in

5x = 15+y

x = 3 + y/5

3(3+y/5) -3/y

= 9 + 3y/5 +3/y