## Calculus with Applications (10th Edition)

The line $$y=8x+9$$ is written in slope-intercept form $$y=mx+b$$ where $m$ is the slope and $b$ is the $y$-intercept. Therefore, the $y$-intercept is $9$. Set $y=0$ and solve for $x$ $$0=8x+9$$ to find the $x$-intercept $$x=-\frac{9}{8}$$