In C language, write a program that will allow a user to calculate the slope of a line. The user will provide the data for the coordinates of the end of the points of the line (x1, y1) and (x2, y2). Use the following end-point coordinates and sample output to help you test your program: Line1: (x1,y1) = (-2, -1.5) (x2,y2) = (4 , 3.2) Line 2: (x1,y1) = (2 , -1) (x2,y2) = (2 , 3) Line 3: (x1,y1) = (3 , 5) (x2,y2) = (-5 , 5) Line 4: (x1,y1) = (-2.5, -2.5) (x2,y2) = (-2.5, -2.5)