this module. 1. The cost c varies directly as the number n of pencils is written as k a. c = kn b. k=cn 2. The speed r of a moving object is inversely proportional to the time t travelled is writte k a. r=kt b. r=- 7= ²/2 c. t = kr d. b. 3. Which is an example of a direct variation? a. xy = 10 y=² c. y = 5x y 4. A car travels a distance of d km in t hours. The formula that relates d to t is d = kt. kind of variation is it? a. direct b. inverse X 6. Which of the following describes an inverse variation? y X y 2 c. joint 5. y varies directly as x and y = 32 when x = 4. Find the constant of variation. a. 8 b. 36 C. 28 d. 128 5 1 5 3 10 5 2 اس b. y = 4 N C. 3 10 15 5 2 20 C. d. C X y X y 40 30 20 8 6 4 k d. c=- 4 2 8 10 4 5 d. 7. What happens to T when h is doubled in the equation T = 4h? a. T is halved c. T is doubled b. T is tripled d. T becomes zero n d. combined 10 2 12 6 2 -=X 8. If y varies directly as x and y = 12 when x = 4, find y when x = 12. 3 b. 4 c. 36 d. 48​