Math

answer asap and you so much!

question 1:

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

x y
2 4
6 12
10 20
14 28

a. yes; k=1 ; y=x
b. yes; k=2; y=2x
c. yes; k=3; y=3x
d. no

question 2:

determine whether y varies directly with x. if so, find the constant of variation k.

2x-4y=0

a. yes; k= 1/2
b. yes; k=2
c. yes; k=-4
d. no

(picture will be provided)