A 10:40 am b i ii iii B 6.6 km €24 €60 €156 c i £33 ii £67 iii £133 Challenge: Strolling sisters Exercise 11C 1 a Check graphs. b 1.25 c 0.7 and pupils’ −2.7 d y = e 0.4 and −1 −2.4 2 a Check graphs. b c 0.8 and pupils’ −1.25 −3.8 d y = e 0.3 and −2.25 −3.3 3 a Check graphs. b 3.75 c 1.6 and pupils’ −0.6 d y = e 2.8 and −0.25 −1.8 4 a Check graphs. b c 2.7 and pupils’ −0.75 −0.7 d y = e 3.6 and −1 −1.6 5 a Check graphs. b c 3.6 and pupils’ −1.25 −0.6 d y = e 3.8 and −2.25 −0.8 Investigation: You them all can’t solve A B a 1.6 and b 0.6 and −2.6 −1.6 C The graph does not cut the x-axis. D own work pupils’ Exercise 11D 1 a b 13.5 m c 1.5 seconds d 3.5 seconds 2 a
b i €24 ii €60 iii €156 c i £33 ii £67 iii £133 Challenge: Strolling sisters A 10:40 am B 6.6 km Exercise 11C 1 a Check pupils’ graphs. b 1.25 c 0.7 and −2.7 d y = −1 e 0.4 and −2.4 2 a Check pupils’ graphs. b −1.25 c 0.8 and −3.8 d y = −2.25 e 0.3 and −3.3 3 a Check pupils’ graphs. b 3.75 c 1.6 and −0.6 d y = −0.25 e 2.8 and −1.8 4 a Check pupils’ graphs. b −0.75 c 2.7 and −0.7 d y = −1 e 3.6 and −1.6 5 a Check pupils’ graphs. b −1.25 c 3.6 and −0.6 d y = −2.25 e 3.8 and −0.8 Investigation: You can’t solve them all A B a 1.6 and −2.6 b 0.6 and −1.6 C The graph does not cut the x-axis. D pupils’ own work Exercise 11D 1 a b 13.5 m c 1.5 seconds d 3.5 seconds 2 a