For questions 1-3 determine whether the equation represents a direct variation. if it does, find the constant of variation. 1. 2 y = 5x +1 a. not a direct variation b. direct variation, constant of variation is 5/2 c. direct variation, constant of variation is 2/5 d. direct variation, constant of variation is 1 -2/5 2. -12x = 6y a. not a direct variation b. direct variation, constant of variation is 1/2 c. direct variation, constant of variation is 2 d. direct variation, constant of variation is -2 3. 7x -1.4y = 0 a. not a direct variation b. direct variation, constant variation is 1/2 c. direct variation, constant variation is 2 d. direct variation, constant variation is -2 for questions 4-6 suppose y varies directly with x. write a direct variation equation that relates x and y. 4. y= -10 when x =2 a. y= -5x b. y= -1/5x c. y= 5x d. y= 1/5 x 5. y= 7 1/2 when x=3 a. y= 3/2x b. y= 2/3x c. y= 5/2 d. y= 2/5 6. y=10.4 when x=4 a. y= 3.4x b. y= 3.8x c. y= 3.2x d. y= 2.6x for questions 7 and 8 for the data in the table, tell whether y varies directly with x. if it does, write an equation for the direct variation. 7. (x. y) (3, 5.4) (7, 12.6) (12, 21.6) a. not a direct variation b. direct variation, y= 1.8x c. direct variation, y= 4x d. direct variation, y= 5/9x 8. (x, y) (-2,1) (3,6) (8,11) a. not a direction variation b. direct variation, y=x c. direct variation, y=2x d. direct variation, y= -2x