4) a) Copy and complete the table below for the relation: x + y = 180 0 30 60 90 120 150 180 180 90 0 X У b) i. using a scale of 2cm to 20units on both axes, draw two perpendicular axes ox an oy. ii. Mark both axes 0 to 180 iii. Plot all the seven points. Use a ruler to join all the points. c) Using your graph, find i. y when x = 100 ii. x when y = 70​