### Answers

Question 1

 (a) $$x = 3$$ (b) $$x = 7$$ (c) $$x = 8$$ (d) $$x = 9$$ $$y = 4$$ $$y = 6$$ $$y = 5$$ $$y = -1$$ (e) $$x = 4$$ (f) $$x = 5$$ (g) $$x = 2$$ (h) $$x = 0.5$$ $$y = 3$$ $$y = 2$$ $$y = -5$$ $$y = 4$$ (i) $$x = 2$$ (j) $$x = -0.5$$ (k) $$x = 3$$ (l) $$x = 0.625$$ $$y = 7$$ $$y = 0.25$$ $$y = 4.5$$ $$y = -0.5$$

Question 2

 (a) $$x = 3$$ (b) $$x = -2$$ (c) $$x = 2$$ (d) $$x = 3$$ $$y = 5$$ $$y = 4$$ $$y = 1$$ $$y = -1$$ (e) $$x = 0.25$$ (f) $$x = 0.3$$ (g) $$x = 8$$ (h) $$x = 0.5$$ $$y = 3$$ $$y = 0.6$$ $$y = -4$$ $$y = 2$$ (i) $$x = 0.75$$ (j) $$x = -2$$ (k) $$x = 0.8$$ (l) $$x = -0.2$$ $$y = -2$$ $$y = 5$$ $$y = -5$$ $$y = -0.4$$

Question 3

 (a) $$x = -1$$ (b) $$x = 5$$ (c) $$x = 2$$ (d) $$x = 2$$ $$y = 4$$ $$y = 3$$ $$y = -3$$ $$y = -1$$ (e) $$x = -2$$ (f) $$x = 3$$ (g) $$x = 4$$ (h) $$x = 4$$ $$y = -3$$ $$y = 4$$ $$y = 2$$ $$y = -2$$ (i) $$x = 8$$ (j) $$x = -0.5$$ (k) $$x = 6$$ (l) $$x = 5$$ $$y = -3$$ $$y = 2$$ $$y = 2$$ $$y = -3$$

Question 4

 (a) $$x = 6$$ (b) $$x = 2$$ (c) $$x = 4$$ (d) $$x = 8$$ $$y = -4$$ $$y = 5$$ $$y = -3$$ $$y = -6$$ (e) $$x = 9$$ (f) $$x = -1$$ (g) $$x = -0.5$$ (h) $$x = -0.25$$ $$y = -5$$ $$y = 6$$ $$y = -3$$ $$y = -4$$ (i) $$x = 2$$ (j) $$x = 0.4$$ (k) $$x = 0.25$$ (l) $$x = 0.45$$ $$y = 3$$ $$y = 0.2$$ $$y = 3$$ $$y = -0.25$$