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Interpret the graph of a linear model

DIFFICULTYintrostandardchallengeexam
QUESTION TYPEMix of allChange
Read the starting valueRead an outputCalculate the contextual rateRecognise the model equationNOWMix of allRecommended
Question 1 of 8

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The graph models water in a nursery tank. \(t\) is measured in minutes, and \(W\) is measured in L

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 Filling time (minutes) and vertical axis Water volume (L). The window is x from -2 to 14 and y from 38 to 56, with unit gridlines in the displayed axis units. The model segment covers the stated domain from (0, 41) to (7, 48). Marked points: P is (2, 43), Q is (4, 45), R is (3, 44).-20246810121438404244464850525456PQRmodelFilling time (minutes)Water volume (L)
1 mark

State the model's rate, including its sign