Help!! How do u answer this

how are you wanting this answered? By the slope? 

D( x )

5*x-7 = 0

5*x-7 = 0

5*x-7 = 0

5*x-7 = 0 // +

7 5*x = 7 // : 5

x = 7/5

x in (-oo:7/5) U (7/5:+oo)

y = 3/(5*x-7) // - 3/(5*x-7)

y-(3/(5*x-7)) = 0

y-3*(5*x-7)^-1 = 0

y-3/(5*x-7) = 0

(y*(5*x-7))/(5*x-7)-3/(5*x-7) = 0 y*(5*x-7)-3 = 0

5*x*y-7*y-3 = 0

(5*x*y-7*y-3)/(5*x-7) = 0

(5*x*y-7*y-3)/(5*x-7) = 0 // * 5*x-7

5*x*y-7*y-3 = 0

5*x*y-7*y-3 = 0 // + -7*y-3

5*x*y = -(-7*y-3) // : 5*y

x = (-(-7*y-3))/(5*y)

x = (3-(-7*y))/(5*y)

x = (3-(-7*y))/(5*y)

Like that??