Question

What is the equation, or a technique to determine a line that is perpendicular to another?

Answer 1

many ways to do that depending on data
*vectors and dot product
*angle calculation & geometry
*equations
*...

Answer 2

The slopes of two perpendicular lines are the negative inverses of each other. This means that, for example, any line with a slope of 2 can be perpendicular to a line with a slope of -1/2.

Answer 3

What if the slope is say -2/3. The perpendicular line would be -1/(2/3)?

Answer 4

i meant to say 2/3* not -2/3.

Answer 5

Yes.