(a)[2]
Find the coordinates of the midpoint of AB.
(b)[3]
Find the equation of the line joining A and B. Give your answer in the form y = mx + c.
(c)[2]
Another line is parallel to AB and goes through the point (0, 7). Write down the equation of this line.
(d)[4]
Find the equation of the line perpendicular to AB that passes through the point (1, 5). Give your answer in the form ax + by + c = 0 where a, b and c are integers.