Question

Graph the points for Line AB and Line CD
A(8, 4), B(4, 3), C(4, -9), D(2, -1)

Is the measure perpendicular, parallel, or neither?
My answer is perpendicular according to the slope formula but when you graph it, it's different. There's no intersection. Help please?

Answer 1

http://upload.wikimedia.org/math/9/d/9/9d9e1aa5fab25d8dd659c0fb6e83234b.png

That's the slope formula

Answer 2

make intersecting lines on a graph

Answer 3

you mean i should draw it?

Answer 4

yes you have to draw it and then mark the spots. that is the only way we can tell what the lines look like.

Answer 5

This is how the graph looks like, but perpendicular lines have intersection points, this one doesn't. And according to how I solved it (twice) with the slope formula, it's a perpendicular line. But in the graph it shows like this.

Answer 6

If the lines look like that then they would intersect perpendicularly.

So i think you are right.

Answer 7

Wait, so you're saying they WILL intersect?

Answer 8

@Geometry_Hater

Answer 9

They're lines right? So they would go on forever.....Eventually intersecting at some point unless of course they are parallel.

Answer 10

OH LOL I NEVER THOUGHT OF THAT '-'

Thanks! XD