What is the slope of the line perpendicular to y 9x?

Answer 1

The product of the slopes of two perpendicular lines is -1. Therefore, you must do the following:

1) Calculate the slope of the original line. If you put a line into the form y = ax + b, the so-called "slope-intercept form", then "a" (i.e., whatever number is in front of the "x") is the slope. Call this slope "m".

2) To get the slope of the perpendicular line, divide -1 by m. For example, if a certain line has a slope of 2, then the perpendicular line has a slope -1/2.