(a) Using a graphing software, on separate axes, draw the graphs of each of the following pairs of simultaneous equations.

(1) x + y = 1 3x + 3y = 3

(ii) 2x + 3y = - 1 20x + 30x = - 10

(iii) x - 2x = 5 5x - 10y = 25

(b) What do you notice about the graphs of each pair of simultaneous equations?

(c) Does each pair of simultaneous equations have any solutions? If yes, what are the solutions?