Chapter 2 - Functions, Equations, and Graphs - Mid-Chapter Quiz - Page 89: 7

Slope-Intercept Form: $y=2x-9$ Slope: $m=2$

Using the properties of equality, in the form $y=mx+b$ (or the Slope-Intercept Form of Linear Equations), the given equation, $ 2x-y=9 ,$ is equivalent to \begin{align*} 2x-y&=9 \\ -y&=-2x+9 \\ -1(-y)&=(-2x+9)(-1) \\ y&=2x-9 .\end{align*} Since $m$ is the slope in $y=mx+b,$ then the slope, $m,$ of the equation above, $y=2x-9,$ is \begin{align*} m=2 .\end{align*}