Question

Which of the following equations represents a direct variation?

Answer 1

Since k is constant (the same for every point), we can find k when given any point by dividing the y-coordinate by the x-coordinate. For example, if y varies directly as x , and y = 6 when x = 2 , the constant of variation is k = = 3 . Thus, the equationdescribing this direct variation is y = 3x .