Graphs of real life functions starter L6 by HC120613094438

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									Starter: Functions and Graphs                               Starter: Functions and Graphs

John has a mobile phone. It costs him 8p/min for his        John has a mobile phone. It costs him 8p/min for his
phone calls.                                                phone calls.

a. How much would it cost for 10 minutes of calls?          a. How much would it cost for 10 minutes of calls?

b. How much would it cost for 100 minutes of calls?         b. How much would it cost for 100 minutes of calls?

c. Fill in the table below:                                 c. Fill in the table below:


 Mins     0    10    20       30   40   50   60   70   80    Mins       0   10   20       30   40   50   60    70   80

 Cost                                                        Cost
 (£)                                                         (£)

d. Plot a graph of minutes vs cost:                         d. Plot a graph of minutes vs cost:

 Cost (£)                                                    Cost (£)
       7                                                           7
       6                                                           6
       5                                                           5
       4                                                           4
       3                                                           3
       2                                                           2
       1                                                           1
       0                                                           0
                                   Minutes                                                           Minutes
         0 10 20 30 40 50 60 70 80                                   0 10 20 30 40 50 60 70 80

								
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