Question

What makes a line perpendicular? How do you know if it is or not?

Answer 1

perpendicular to what ?

Answer 2

you mean perpendicular to another line ?

Answer 3

yeah,... like if you are given 2/3 what is perpendicular to it?

Answer 4

2/3 is a number, not a line.

Answer 5

Okay well like a slope?

Answer 6

rephrase ur question :P

Answer 7

the slopes are what you have to compare. The slopes have to be negative reciprocals of each other. All that means is " flip " the slope and change the sign.
So if you have slope 2/3....if you flip it and change the sign (-3/2), then these are negative reciprocals of each other and they will be perpendicular

Answer 8

Thank You!