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Question 1 of 8

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The graph models the charge for a printing session. \(t\) is measured in minutes, and \(C\) is measured in $

The model's domain is \(0 \le t \le 7\). The graph uses unit gridlines in the stated axis units

Cartesian graph with horizontal axis Machine time (minutes) and vertical axis Total charge ($). The window is x from -1 to 8 and y from 54 to 74, with unit gridlines in the displayed axis units. The model segment covers the stated domain from (0, 57) to (7, 71). Marked points: P is (2, 61), Q is (4, 65), R is (6, 69).-10123456785456586062646668707274PQRmodelMachine time (minutes)Total charge ($)
1 mark

Which equation represents the graph?