Parallel, perpendicular, or neither

[RicanGurl]

Determine whether the lines L1 and L2, passing through the pair of points are parallel, perpendicular or neither


L1: (1, -1 ), (7, 1)
L2: (3, -10), (9, -7)[/i]

 

[pka]

Parallel lines have the same slope.
Two lines (neither of which is vertical) are perpendicular if the product of their slopes is equal to –1.

 

[RicanGurl]

I see what you are saying, so my question to you is

so since it does not have the same slope, I cheked one has the slope of 2 the other 3 , that means that it is not parallel or perpendicular, that means that it is neither?

 

[pka]

You have the right idea, but very poor arithmetic skills.
The first line has slope \(\displaystyle \frac {1} {3}\).
The second line has slope \(\displaystyle \frac {1} {2}\).

 

[RicanGurl]

MHmm

I see, yes, my friend is telling me then it means it is neither, but I want to confirm with you.

 

[stapel]

I see, yes, my friend is telling me then it means it is neither, but I want to confirm with you.

Rather than waiting for somebody to complete the work here, or hoping your friend is giving you the right answers, why not do the calculations yourself, so you're sure? :wink:

Eliz.