Determine whether y varies directly with x. If so, find the constant of variation and write the equation. x | y-2 | -4-4 | -8-16 | -32a. Nob. yes; k=-2 and y=-2xc. yes; k=1/2 and y=1/2xd. yes; k=2 and y=2x

yes.
the every x value multiplying 2 gets the corresponding y values, so y=2x
d is the correct answer.