1. Tell whether an equation of the form xy = k,
where k
0, represents a direct or inverse
variation.
2. Refer to the application at the beginning of the lesson. Describe a reasonable domain and range.
3. Explain how you find the constant of variation in a direct variation.
4. You Decide Morgan says that a person's height varies directly as his or her age. Do you agree? Explain.
Determine whihc equations represent inverse variations and which represent direct variations. Then find the constant of variation.
5. mn = 5
6. a = -3b
Solve. Assume that y varies directly as x.
7. If y = 27, when x = 6, find x when y = 45.
8. If y = -7 when x = -14, find y when x = 20.
Solve. Assume that y varies inversely as x.
9. If y = 99 when x = 11, find x when y = 11.
10. If y = -6 when x = -2, find y when x = 5.