Slope =   (y₂- y₁) / (x₂- x₁)
Points  C( 3, -5) and D (6, 0)  compare to (x₁, y₁) and  (x₂, y₂)
Slope = (0 - -5) / (6- 3)  =   (0+5) / (3) =  5/3
Slope = 5/3
Equation of line given a slope and point,   y - y₁ = m(x - x₁)
m = 5/3,    let point C( 3, -5) = (x₁, y₁) 
  y -  - 5 =   (5/3) (x - 3)
 
  y + 5  = (5/3)(x - 3)
   3(y + 5) = 5(x - 3)
   
    3y + 15 = 5x - 15
     3y =  5x - 15 - 15
     3y = 5x - 30
Hence the equation of the line is 3y = 5x - 30