B = 9 + d, where B is
Bob's age and d is his
dog's age.- -3 13. 66 14. 6 15. 4 16. 0, -4 17. 3, 7
- no solution 19. y , | 20. Its value is based on the
first value. 21. 4 22. There are no breaks in the graph
Lesson 4-1 dd. 234-23<
Go t It? l a. Time, length; the length of the board
remains constant for a time before another piece is cut
off. b. Time, cost; the cost remains constant for a certain
number of minutes. 2. C
3a. Answers may vary. Sample:
Sue’s Number of Laps per Minute
Number of Minutes
Number of Laps
Swi ngi ng Hi gher Begi n Swi ng DownSl ow St op
Ti m e
b. The end of the graph would decrease sharply.
Lesso n Ch eck 1. Car weight, fuel used; the heavier the
car, the more fuel is used. 2. The temperature rises
slightly in the first 2 h and then falls over the next 4 h.- rising slowly: B; constant: C; falling quickly: D
- Answers may vary. Sample: the depth of water in a
stream bed over time
Ex e r c i se s 5. Number of pounds, total cost; as the
number of pounds increases, the total cost goes up, at
first quickly and then more slowly. 7. Area painted, paint
in can; the more you paint, the less paint left in the can.
You are using the paint at a constant rate. 9. A - Answers may vary. Sample:
€ = 1.5m, where m is
the number of minutes
and € is the number of
laps.Sue’s N um ber o f Laps
per MinuteNumber of MinutesTot al Co st f or Car t o n s of Eg gs
Number of Cartons
Tot al Cost (doll ars)
C = 3n, where C is
the cost and n is
the number of
cartons.Total Cost fo r Cartons o f Eggs- Answers may vary. Sample:
Number of Cartons- The graph shown represents the relationship between the
number of shirts and the cost per shirt, not the total cost.
Number of Shirts
Selected AnswersSelectedA n s w /e rs