Patrick M. answered 01/19/20
15 Year High School Math Teacher - All Levels - National Board Certifi
First, solve for y in the equation to get it into slope intercept form.
Next, do the opposite reciprocal of the slope (opposite sign and flipped fraction)
Plug that slope into y=mx+b for m
Then, plug your (-1,-3) in for the y and x into the same equation.
Solve for b
Nor plug the perpendicular slope, and the b in, and there is your equation.