Introduction To Graphs

Plot the given points on a graph sheet and check if the points lie on
a straight line. If not, name the shape they form when joined in the
given order.
(a) (1, 2), (2, 4), (3, 6), (4, 8).
(b) (1, 1), (1, 2), (2, 1), (2, 2).
(c) (4, 2), (2, 4), (3, 3), (5, 4).