## Algebra 1: Common Core (15th Edition)

An equation is called a direct variation if it is in the form of $y=kx$, where $k\ne0$ is the constant variation The value of the constant of variation is obtained by dividing x: $k=\frac{y}{x}$ $2y=5x+1$ $y=\frac{5}{2}x+\frac{1}{2}$ This equation is not in the form \$y=kx, so the equation is not a direct variation.