Which equation represents a direct variation? What is the constant of variation?

3y = 2x+1; 1

y=-5x-11; 5

4y=-12x; - 3

y+7=2x-1; 7

C

Step-by-step explanation:

The equation of quantities in direct variation is

y = kx ← k is the constant of variation

The only equation in this form is 4y = - 12x, that is

4y = - 12x (divide both sides by 4)

y = - 3x ← in form representing direct variation with k = - 3 → C