Problem 3) Let 1 be a line in the xy plane. If l is a vertical line, its equation is x=a for some real number a. Suppose I is not a vertical line and its slope is m. Then the equation of l is y=mx+b, where b is the y-intercept. If 1 passes through the point (x0,y0), the equation of 1 can be written as yy0=m(xx0). If (x1,y1) and (x2,y2) are two points in the xy plane and x1=x2, the slope of the line passing through these points is m=(y2y1)/(x2x1). Write a program that prompts the user for two po