a Copy and complete the table of values for the relation y x x 2 for 3 x 3 X y 3 2 1 4 0 1 2 2 3 4 b Using scales of 2cm to 1 unit on the x axis and 2cm to 2 units on the y axis draw a graph of the relation y x x 2 c From the graph find the i minimum value of y ii roots of the equation x x 2 0 iii gradient of the curve at x 0 5