SOLUTION: Can you determine the cost for 7 hours using the chart 2,5 5,11 8,17 10,21. 7,?

Question 829268: Can you determine the cost for 7 hours using the chart
2,5 5,11 8,17 10,21. 7,?
Answer by josgarithmetic(39617) (Show Source): You can put this solution on YOUR website!
Do you mean this way:
(2,5), (5,11), (8,17), (10,21), ( 7,?);
Find the coordinate when x=7 ?

The slope among each pair of data points is 2.
(21-17)/(10-8)=2;
(17-11)/(8-5)=2;
(11-5)/(5-2)=2.

Simply start at (5,11). Increase from 5 by TWO units; ;and increase from 11 by FOUR units. What point it this?
------------(7, 15)
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