You can put this solution on YOUR website! In an equation in the form y=MX+B, M is the slope of the curve and B is the value of y when x=0.
it is possble to have 2 or more equations for a same line for different values of x.
Example:
y = Mx + C for 0
& y = Nx+ D for 5<=x
(M & N are two different values of slope of the same graph.)
Hope this helps.