Equation of a line (Point/Point)

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Find the equation of the line passsing through the Points $P\left(-7,-14\right)$ and $Q\left(-13,-9\right)$.

**Answer**

The slope of the line joining the points $P\left(-7,-14\right)$ and $Q\left(-13,-9\right)$ is given by $m=\frac{-9+14}{-13+7}=\frac{-5}{6}$

The equation of the line is$$y - y_0 = m\left(x - x_0\right)$$

or, $$y= mx + y_0-mx_0$$

Substituting the values of $m$, $x_0$ and $y_0$, we get

$y =-\frac{5}{6}x-14-\left(-\frac{5}{6}\right)\left(-7\right)$

or, $y =-\frac{5}{6}x-14-\frac{35}{6}$

or, $y=-\frac{5}{6}x-\frac{119}{6}$