Check it out:
Take the
2
... Write it as a fraction:
Flip it over:
... and change the sign:
Let's do a problem:
| Let's find the equation of the line that passes through the point | ||
| ( 1 , 3 ) and is perpendicular to the line |
 |
. |
What do we need?
|
a point
|
a slope
|
STEP 1: Find the slope
| It's perpendicular to |
 |
... |
So, we'll get this guy's slope ... flip it and change the sign! Easy!
