Question

Determine whether y varies directly with x. If so, find the constant of variation k and write the equation.

x:
7
13
19
25

y:
11.2
20.8
30.4
40

A. yes; k = 1.6; y = 1.6x

B. yes; k = 6; y = 6x

C. yes; k = 7; y = 7x

D. no

Answer 1

Divide each value of y by the corresponding value of x. If the answer is the same each time, y varies directly with x and the quotient is the variation constant k.

Answer 2

y varies directly with x

Answer 3

yx=k correct?

Answer 4

No, I believe thats the equation for inversely proportional.

Answer 5

my bad yeah youre right

Answer 6

For directly proportional, y=kx

Answer 7

sorry im trying to lead him to the answer not list it

Answer 8

so is the answer A

Answer 9

Yep, the y values are 1.6 times the x values, so the answer is A.

Answer 10

If the quotient for each y/x =1.6, then it is direct variation with k =1.6