Answer:
For example, if y varies directly as x, and y = 6 when x = 2, the constant of variation is k = = 3. Thus, the equation describing this direct variation is y = 3x. ... Thus, given any two points (x1, y1) and (x2, y2) that satisfy the equation, = k and = k. Consequently, = for any two points that satisfy the equation.
A relationship is said to have direct variation when one variable changes and the second variable changes proportionally; the ratio of the second variable to the first variable remains constant. For example, when y varies directly as x, there is a constant, k, that is the ratio of y:x.
If it pass through (0, 0) it's constant
