Line BC contains points B (4, −5) and C (3, 2). Line DE contains points D (2, 0) and E (9, 1). Lines BC and DE are

parallel

perpendicular

neither

Question

Line BC contains points B (4, −5) and C (3, 2). Line DE contains points D (2, 0) and E (9, 1). Lines BC and DE are

 parallel

 perpendicular

 neither

anonymous · Answer

attachment

mathmate · Answer

Check slopes of the two lines.
If the slopes are identical, they are parallel.
If the product of slopes equals -1, they are perpendicular.
If not either, they are neither parallel nor perpendicular.

anonymous · Answer

Oh, yeah! thanks!

anonymous · Answer

I got 7 and then -1/7 so perpendicular

anonymous · Answer

right @mathmate

anonymous · Answer

@jim_thompson5910

jim_thompson5910 · Answer

how did you get 7?

anonymous · Answer

from the first two coordinates
2-(-5) and then 3-4

anonymous · Answer

oh 7/-1

jim_thompson5910 · Answer

better, it should be -7 and not +7

jim_thompson5910 · Answer

the same for -1/7, just the other way around

jim_thompson5910 · Answer

you *should* have

slope of BC: 7
slope of DE: -1/7

turns out they still multiply to -1 making your final answer the same

jim_thompson5910 · Answer

so be sure to subtract in the same order each time

anonymous · Answer

wohoo perpendicularrrr