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The graph models water in a fire-reserve 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 -3 to 14 and y from 27 to 48, with unit gridlines in the displayed axis units. The model segment covers the stated domain from (0, 32) to (7, 39). Marked points: P is (3, 35), Q is (5, 37), R is (2, 34).-2024681012142830323436384042444648PQRmodelFilling time (minutes)Water volume (L)
1 mark

Which intercept-slope equation matches the displayed model?