1.   If y varies inversely as x and y = 12 when x = 7, find x when y = 2.
    A. 10 B. 5
    C. 7 D. 42
    Hint

  2.   If y varies inversely as the cube of x and y = 8 when x = 2, find
x when y = 1.
    A. x = 8 B. x = 1
    C. x = 4 D. x = 2
    Hint

  3.   If y varies jointly as x and the cube root of z,
and y = 30 when x = -5
and z = 27, find y when z = -8 and x = 0.5.
    A. y = 20 B. y = 2
    C. y = 4 D. y = -2
    Hint

  4.   Which best describes this graph?
   
    A. none of these B. inverse variation
    C. joint variation D. direct variation
    Hint

  5.   Dakota wants to cook a meal for his family. He knows that the more people who help, the less time it will take to prepare the food. Write an equation that represents this situation. Let C be the cooks in the kitchen, T be the time and k as the constant of variation.
    A. k = CT B. k = CT
    C. T = kC D. C = kT
    Hint