Question

Are the slopes given 1/-3 and -1/-3 of two lines, parallel, perpendicular, neither or both? I think the two slopes of two lines are both, but I'm not quite sure. May someone help me?

Answer 1

neither, since 1/-3 (- 1/3) ≠ -1/-3 (+ 1/3)
and (1/-3)(-1/-3) = -1/9 ≠ -1
Nice try. two lines can clearly NOT be both perpendicular and parallel!

Answer 2

but, I thought there was more to definition of perpendicular besides some stuff intersecting and stuff..

Answer 3

All I need is help, I've looked at videos and all. Came to an dead end, I used the points given to come up with these slopes.

Answer 4

:( Could someone send me links to videos or practice problems so I could understand?

Answer 5

parallel lines have the same slopes
Two slopes m1 and m2 belong to perpendicular lines only if m1 * m2 = -1
So, if you calculated your slopes correctly, the two lines are neither parallel nor perpendicular.
That means the two lines intersect at exactly one unique point.

If those videos you watched didn't explain this, they were failing to explain things well.

Answer 6

Okay thank you! I'm going to redo my calculations to see if I'm still correct, thank you! I'll let you know.

Answer 7

Ella, make an account for yourself at https://www.khanacademy.org -- it costs you nothing. This way, you can select the subjects you need help on, take quizzes, etc., and keep track of what you're learning.

Answer 8

Thank you, I will! I also took about a good hour on this problem, coming up with different slopes each time. The last time I found out that the slopes I put we're wrong and I now understand it! Thanks for the help both of you.