Answers: 1. a)0.08 b) 0.45 c) 65 the cost per metre, in dollars, of wood = 2.3P $34.50 2. a)2.30; b) c) C 3. a) b) 3.00; the cost per hour to park in this parking lot c) = 3.00t C 4. a) (h) (km) t d 0 0 1 80 2 160 3 240 b) see graph to the right 80 c) d) = 80t d 5. a) Tomatoes cost $2.50 per kg. b) = 2.5m C partial variation partial variation direct variation 6. a) b) c) 7. a) partial variation b) direct variation c) direct variation d) partial variation 8. a) 3; 1 b) = + 3 y x c) The graph intersects the at (0, 3). As the y-axis increase by 1, the also increase x-values y-values by 1.
Answers: 1. a)0.08 b) 0.45 c) 65 2. a)2.30; the cost per metre, in dollars, of wood b) C = 2.3P c) $34.50 3. a) b) 3.00; the cost per hour to park in this parking lot c) C = 3.00t 4. a) t (h) d (km) 0 0 1 80 2 160 3 240 b) see graph to the right c) 80 d) d = 80t 5. a) Tomatoes cost $2.50 per kg. b) C = 2.5m 6. a) partial variation b) partial variation c) direct variation 7. a) partial variation b) direct variation c) direct variation d) partial variation 8. a) 3; 1 b) y = x + 3 c) The graph intersects the y-axis at (0, 3). As the x-values increase by 1, the y-values also increase by 1.