# How do you write the point slope form of the equation given m=-7 and (1,-1)?

Jun 19, 2017

See a solution process below:

#### Explanation:

The point-slope formula states: $\left(y - \textcolor{red}{{y}_{1}}\right) = \textcolor{b l u e}{m} \left(x - \textcolor{red}{{x}_{1}}\right)$

Where $\textcolor{b l u e}{m}$ is the slope and $\left(\textcolor{red}{{x}_{1} , {y}_{1}}\right)$ is a point the line passes through.

Substituting the slope and values from the point in the problem gives:

$\left(y - \textcolor{red}{- 1}\right) = \textcolor{b l u e}{- 7} \left(x - \textcolor{red}{1}\right)$

$\left(y + \textcolor{red}{1}\right) = \textcolor{b l u e}{- 7} \left(x - \textcolor{red}{1}\right)$