19 19 The diagram shows the graph of y = x 2 – 3x. y 4 3 2 1
–1
0
1
2
3
4 x
–1 –2 –3
(a) By drawing a suitable straight line on this diagram, solve the equation x 2 – 3x = x – 1. ................................................................................................................................................... ................................................................................................................................................... ................................................................................................................................................... ................................................................................................................................................... ................................................................................................................................................... ................................................................................................................................................... (a) ____________________________ [3] (b) Find the equation of the line that would need to be drawn on the grid to solve the equation x 2 – 5x + 2 = 0. ................................................................................................................................................... ................................................................................................................................................... ................................................................................................................................................... ................................................................................................................................................... (b) y = ____________________________ [2] TURN OVER FOR QUESTION 20 © OCR 2009