Let L be the line that passes through the points with coordinates (1,1) and (-1,3).
(a) Determine the equation (in the form y = mx + b) of the line L.
(b) Determine the equation of the line K that passes through the (0, -1) and is perpen-
dicular to the line L.
(c) Find the coordinates of the point at which the lines and K intersect.