Mark M. answered • 09/30/19

Math Tutor--High School/College levels

Since Ax + By = C, By = -Ax + C. So, y = (-A/B)x + C/B.

This line has slope -A/B.

Any line perpendicular to the line with equation Ax + By = C has slope -1 / (-A/B) = B / A.

Equation of line with slope B / A and containing the point (2,11) is:

y - 11 = (B/A)(x - 2)