Two perpendicular lines must:
A. have slopes that are negative reciprocals
B. cross each other
C. cross each other with the same slope
D.have slopes that are reciprocals

Question

Two perpendicular lines must:
A. have slopes that are negative reciprocals
B. cross each other
C. cross each other with the same slope
D.have slopes that are reciprocals

aaronandyson · Answer

Is this related to slopes?

zarkam21 · Answer

Yes

aaronandyson · Answer

Let the two slopes be m_1 and m_2

aaronandyson · Answer

When these two lines are parallel m_1 = m_2

jadeishere · Answer

Aaron, it's not discussing parallel lines, actually, quite the oppposite

aaronandyson · Answer

I need to explain this to further explain it ..in my way XD

precal · Answer

A

zarkam21 · Answer

So A ?

precal · Answer

one is positive and one is negative

zarkam21 · Answer

Can everyone confirm this? :)

aaronandyson · Answer

So when these two lines are perpendicular ,
m1*m2 = -1

precal · Answer

reciprocals as well

zarkam21 · Answer

@Jadeishere  is A correct?

precal · Answer

m=1/3   and m=-3  will be perpendicular

precal · Answer

you could graph it to see that this is true

aaronandyson · Answer

A looks good.

kinged · Answer

It actually looks stunning, for some reason...

jadeishere · Answer

Yes, Zarkam, A is correct. When a line has a negative reciprocal slope, they intersect at exactly a 90 degree angle, basically, flipping the line over the x or the y axis