Determine whether the equation represents a direct variation. if it does, find the constant of variation. 2y = 5x + 1 a) not a direct variation b) direct variation, constant of variation is 5/2 c) direct variation, constant of variation is 2/5 d) direct variation, constant of variation is 1-2/5 explain if you can ! i don’t understand how to determine whether or not an equation is a direct variation.