Question

explain how can you determine if the graphs of two lines are parallel or perpendicular without graphing the lines

Answer 1

parallel: same slope

Answer 2

perp: one slope is negative reciprocal of the other (m, -1/m)

Answer 3

http://openstudy.com/study?login#/updates/4f4944bae4b00c3c5d32f766

Answer 4

...but often forgotten: can also have one of slope 0 and one of undefined slope (for example, y=3 and x=2)

Answer 5

deja vu, that certain feeling you get when you think you've been there before

Answer 6

:)

Answer 7

thank you so much(:

Answer 8

welcome.