Draw the graph of each of the following linear equations and answer the following question.
(i) y = x (ii) y = 2x (iii) y = -2x (iv) y = 3x v) y = -3x
(i) Are all these equations of the form y = mx, where m is a real number?
(ii) Are all these graphs passing through the origin?
(iii) What can you conclude about these graphs?