For the equation - 4y = 8x, what is the constant of variation?

A: - 4

B: - 2

C: 1

D: 2

-4y = 8x

Divide both sides by - 4

y = - 2x

This is in the form of y = kx, where k is the constant of variation.

y = kx is the direct

That means, k = - 2.

The constant of variation is B. - 2.