6. Suppose y varies directly as x, and y= 16 when x = 8. Find y when x = 16.

7 Suppose y varies directly as x, and y = 21 when x = 3. Find x when y = 42.

8. Suppose v varies directly as g, and v = 36 when g = 4. Find v when g = 11.

9. Suppose a varies directly as b, and a = 7 when b = 2. Find b when a = 21.

10. Suppose y varies directly as x, and y = 9 when x = 3/2. Find y when x = 1.