a ski lift is to be built parallel to the side of a mountain

a ski lift is to be built parallel to the side of a mountain. the surveyor tells the builder that the coordinates of the two points on the side of the mountain are (400,800) and (600,5000). the lowest point of the ski lift is to be at the point (0,40)what is the slope of the mountain?(show equation used)find the linear function that represents the ski lift. express it in a slope intercept form