Question

When I plot these points, they are neither parallel or perpendicular. The slopes are WX (2) and YZ (-2). What am I doing wrong?

Line WX contains (−1, 2) and (4, 12) Line YZ contains points (−5, 8) and (2, −6). Lines WX and YZ are

perpendicular because the slopes are the same

parallel because the product of the slopes is −1

perpendicular because the product of the slopes is −1

parallel because the slopes are the same

Answer 1

is not supposed to be the points per se, is supposed to be the lines they make :S

Answer 2

I know. Sorry, that's what I meant.

Answer 3

By plot, I meant I plotted and connected them to their respective lines. That's how I got the slope.

Answer 4

ohh

Answer 5

The create two ~53degree angles and two ~126degree angles.

Answer 6

Which obviously is neither parallel or perpendicular.

Answer 7

well, you're correct, they don't, but that depends on your plotting "scale factor" for each axis, they won't if the scale of the y-axis and x-axis is one to one

Answer 8

for the graphing board that is

Answer 9

I don't understand.

Answer 10

lemme get the equatins and plot them, so I can show you

Answer 11

Oh, real quick, if is straight up and down, it's slope is undefined right? And horizontal is a slope of zero

Answer 12

yes

Answer 13

well, dohh, they're not supposed to be perpendicular :S

Answer 14

darn, my bad, I guess it skipped me for a sec

Answer 15

anyhow, perpendicular lines have NEGATIVE RECIPROCAL slopes
what you have there are just negative version of the positive

so x is increasing from left to right
-x is decreasing from left to right

Answer 16

a perpendicular line to a slope of 2 line will be one with -1/2, negative reciprocal

Answer 17

so -2 is just the "decreasing" version of "2"

Answer 18

In order to make the line perpendicular, it would have to have a slope of -1/2 not -2.

Answer 19

Besides, none of the answers fit. The slopes are not the same. The sum of the slopes is 0.

Answer 20

Any ideas? @Lagoonabarbie

Answer 21

@ababylizard When I plot the points on paper, I got this..

Answer 22

Showing they do intersect perpendicularly, and The slope is -2 for one, and 2 for the other

Answer 23

In order for lines to intersect perpendicularly, they need to be negative reciprocals of one another.

Answer 24

For 2, it has to be -1/2