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Explan Extra Practice Identifying a Proportional Relationship In Exercises 25 and 26, use a graph to determine whether x and y are in a proportional relationship. Explain. 26. 25 4 X 2 3 4 X 2 3 3.0 6 9 12 y 1.5 2.0 2.5 Writing a Model In Exercises 27-32, write a model for the statement. 27. I varies directly as V. 28. V is directly proportional to t. 29. p varies inversely as d. 30. P is inversely proportional to the square of 1 + r. 31. A varies jointly as / and w. 32. V varies jointly as h and the square of r. Writing an Equation In Exercises 33-38, find the constant of proportionality and write an equation that relates the variables. 33. h is directly proportional to r, and h = 28 when r = 12. 34. n varies inversely as m, and n = 32 when m = 1.5. 35. F varies jointly as x and y, and F = 500 when x = 15 and 36. I varies jointly as h and the square of b, and V = 288 y = 8. when h = 6 and b = 12. 37. d varies directly as the square of x and inversely with r, and d = 3000 when x = 10 and r = 4. 38. z is directly proportional to x and inversely proportional to the square of y, and z = 720 when x = 48 and y = 81