# How do you write an equation of a line that goes thru (2,-1) and has slope m=3?

$\left(y + 1\right) = 3 \left(x - 2\right)$
The general slope-point form for a linear equation with slope $m$ through a point $\left(\hat{x} , \hat{y}\right)$ is
$\textcolor{w h i t e}{\text{XXXX}}$$\left(y - \hat{y}\right) = m \left(x - \hat{x}\right)$
Substituting the given values for $m$ and $\left(\hat{x} , \hat{y}\right)$ gives the answer above.