Determine whether y varies directly with x. if so, find the constant of variation k and write the equation.
x y
6 24
18 72
54 216
162 648
a) yes; k = 4; y = 4x
b) yes; k = 3; y = 3x
c) yes; k = 6; y = 6x
d) no

Step-by-step explanation:

The constant of proportionality is usually presented as the variable k. It is usually written as:

f(x) = kx

where f(x) means a function of x. It can also be another variable, for example, y,

We test each pair to find k,

24 = 6k

k = 24/6 = 4

72 = 18k

k = 72/18 = 4

216 = 54k

k = 4

648 = 162k

k = 4

Thus, the answer is A. yes and k=4.

it is true

step-by-step explanation:

all the combinations add up i used   calculator