Summary chapter 7: wordformulas 7.3, 7.4 en 7.5

• Wiskunde
• Middelbare school
• havo, vwo
• Leerjaar 1

C7 Wordformulas

7.3

time	0	1	2	3	4	5
distance

time	0	1	2	3	4	5
distance	600	?	?	?	300	?

time	0	1	2	3	4	5
distance	600	525	450	375	300	225

300:4=75

time	0	1	2	3	4	5
distance	600	525	450	375	300	225

300:4=75

formula: distance in km = 600 - time x 75 or

                 distance in km = 600 - 75 x time

7.4

y = ax + b

stapgrootte (per number)

fixed amount

Andrew:

price = 80 + 25 x time

Best:

price = 20 x time

8 right	1
200 up	25

8 right	1
280 up	35

7.4

4 right	1
60 down	15

7.4

4 right	1
60 down	15

height = 120 - 15 x time

7.4

2 right	1
1 up	0.5

7.4

2 right	1
1 up	0.5

price = 20 + 0.5 x weight

7.5