x_one = input("Enter First x-axis number: ")
x_two = input("Enter Second x-axis number: ")
y_one = input("Enter First y-axis number: ")
y_two = input("Enter Second y-axis number: ")

if int(x_one) == int(x_two):
    print("The line is vertical, x="+str(x_one))
else:
    m = (int(y_two)-int(y_one)) / (int(x_two)-int(x_one))
    b = int(y_one) - m * int(x_one)
    print("The equation of the line is y="+str(m)+" x="+str(b))

if m == 0:
    print("The line is undefined")
elif m < 0:
    print("The line is negative.")
else:
    print("The line is positive.")