The point A has coordinates (5, -4)
The point B has coordinates (13, 1)
a) Work out the coordinates of the midpoint of AB.

Line L has equation y = 2 - 3x
b) Write down the gradient of Line L.

Line L has equation y = 2 - 3x
c) Does the point with coordinates (100, -302) lie on line L?
You must give a reason for your answer.