# How do you write the point-slope form of an equation of the line with m=-3, b=0?

$y - \left(- 3\right) = - 3 \left(x - 1\right)$
The previous answer is given in slope-intercept form. The formula for point-slope form is $\left(y - y 1\right) = m \left(x - x 1\right)$
So we can plug in any point to find the answer in point-slope form. Using $x = 1$ in the formula $y = - 3 x$,
$y$ must be $- 3$
So the answer in point-slope form is $y - \left(- 3\right) = - 3 \left(x - 1\right)$