# How do you write an equation of the line in point slope form with slope =3, (4,-8)?

Jun 11, 2015

$y = m \cdot x + b$
Where $m =$slope and $b = y$-intercept

#### Explanation:

If we use the known data (slope and one known $x , y$:
$- 8 = 3 \cdot 4 + b \to b = - 20$

So the equation: $y = 3 x - 20$
graph{3x-20 [-39.88, 52.64, -24.55, 21.7]}