SOLUTION: How can I determine if two lines are perendicular?

Question 451720: How can I determine if two lines are perendicular?
Found 2 solutions by ewatrrr, richard1234:
Answer by ewatrrr(24785) (Show Source): You can put this solution on YOUR website!

Hi
How can I determine if two lines are perendicular?
I. Put both lines in the slope-intercept form
II. compare their slopes
III. If the slopes ae negative reciprcals of one another: for ex: -2/3 and 3/2
THEN these lines are perpendicular

Answer by richard1234(7193) (Show Source): You can put this solution on YOUR website!
Show that the angle in between these lines is 90 degrees. Or show that the slopes are negative reciprocals of each other. Or if your lines are vectors, show that the dot product is equal to 0. Quite a few ways to prove this.
RELATED QUESTIONS
How can you determine if two lines are... (answered by jojo14344,solver91311)
How can you determine if two lines are... (answered by vleith)
How can you determine if two lines are... (answered by solver91311,jim_thompson5910)
How can you mathematically determine if two lines are... (answered by stanbon)
How can you determine if two lines are perpendicular? (answered by EMStelley)
How can you determine if two lines are perpendicular? (answered by stanbon)
How can you determine if two lines are... (answered by Fombitz)
I need help with this question how can determine if two lines are... (answered by stanbon)
When graphing how can I determine if two lines are perpendicular. (answered by richwmiller)