Mathematics
Araceli782
45

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

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(1) Answers
BritanyWolverton894

Number 2 is D. The pattern is quite simple, basically the formula for direct variation is y=kx, so in number 2 the problem shows -12x=6y, so then you would end up dividing the numbers, and this should you solve your other answers. Hope this helps!

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