7. y = k/x is an example of A. direct variation B. inverse variation C. joint variation D. combined variation
8. What happens to T when H is doubled in the equation T = 4H? A. T is halved B. T is tripled C. T is doubled D. T becomes Zero
9. Which is an example of direct variation? A. xy = 5 B. y = 3/x C. y = 2x D. 3/y = x
10. y varies inversely as x, and y = 12 when x = 8, find y when x = -5. A. 4 B. 1/5 C. 4/5 D. -4/5
11. If two men can do a portion of a job in 8 days, how many men can do the same job in 4 days? A. 7 B. 6 C. 5 D.4
12. y varies inversely as x and y = 50 when x = 4, find y when x = 40. A.5 B. 10 C. 40 D. 50
13. The area of a triangle varies jointly as its base and altitude. If the area of a triangle is 18cm2 when the base is 9 cm and the altitude is 4 cm, find the altitude when the area is 108 cm2 and the base is 18 cm. A. 10 cm B. 24 cm C. 12 cm D. 12 cm
14. If x varies inversely as y and y = 7 when x = 4, find y when x = 12. A. 7 B. 3/7 C. 7/3 D. 12 kx 15. Z =- is an example of у A. direct variation B. inverse variation C. joint variation joint variation D. combined variation
