Question

How do you find the slope that is perpendicular to the line `3x+9y=9`?

Answer 1

The slope of the perpendicular line is `m_1=3`

Explanation:

The slope of the line `3x+9y=9 or 9y= -3x+9 or y= -1/3x+1` is `m=-1/3`(comparing with the equation `y=mx+c`).We know the product of slopes of prpendicular lines is `-1:.m_1=-1/(-1/3)=3`[Ans]