To write the equation of direct variation, we replace the letter k k by the number 2 2 in the equation y = k x y = kx. When an equation that represents direct variation is graphed in the Cartesian Plane, it is always a straight line passing through the origin. Think of it as the Slope-Intercept Form of a line written as.
A direct variation, also called direct proportion is a relationship between two variables x and y that can be written as y = kx, k ≠ 0. This situation occurs when the ratio of two variables is constant.
What Is The Direct Variation Formula? A direct variation is a linear equation that can be written in the form y = kx , where k is a nonzero constant. The number k is called the constant of proportionality or constant of variation.