translate each in the form y=kx, where k is constant
1.the velocity (v) of a rim of pulley varies directly as its diameter (d).
2. the cost (c) of a dozen oranges varies directly as the price (p) of one.
3. if you take a journey of 100 miles, your time (t) is directly propotional to your rate (r)
4.I ride for 3 hours in an airplane. the distance (D) I go varies directly as the rate of an airplane (ai).
5. the amount (A) a boy earns a week varies directly as the square of his daily rate (rt)
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DIRECT VARIATION
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