## Precalculus (6th Edition) Blitzer

$y=-3x+6$
The point-slope form between two points is given by $m= \dfrac{y_2-y_1}{x_2-x_1}$ Plug in the given data. $m= \dfrac{-3-3}{3-1}=-3$ Now, the point-slope equation is: $y-y_1= m (x-x_1)$ becomes: $y-3=-3(x-1)$ Which simplifies to: $y=-3x+6$