Can someone please tell me whether the line that passes through the two given points areparallel or perpendicular (or neither to a line with a slope of -2? (9,9), (11,10) and (9,9),(11,5) and (9,9),(11,-9), I need to know which would be perpendicular, which would be parelle, and which one would be neither, can someone please help?
2007-06-15 20:10:59 · 4 answers · asked by ambi565 2 in Science & Mathematics ➔ Mathematics
Points (9,9) and (11),(10)
m = (10 - 9) (11 - 9)
m = 1 / 2
Is perpendicular to line with slope - 2
(1/2 x - 2 = - 1)
Points (9,9) and (11,5)
m = - 4 / 2
m = - 2
Is parallel to given line. (same slope)
Points (9,9) and (11,- 9)
m = 18/2 = 9
Neither perpendicular or parallel.
2007-06-16 19:45:32 · answer #1 · answered by Como 7 · 0⤊ 0⤋
I reckon when you said 'a slope of -2' means a gradient of -2.
Parallel means that the gradients of the lines are equal.
Perpendicular: Use -1 (divide) (that number). If it is correct, that means the lines are perpendicular to each other.
Sorry I can't help much, 'cos your question is placed quite... Strangely. I hope the above information helps though!
2007-06-16 03:15:21 · answer #2 · answered by Xaelia 5 · 0⤊ 0⤋
parallel would be if the slopes were the same...
and perpendicular if they were negative reciprocals
did you try using y=mx+b
just remember to substitute the right numbers in!
hope that helps =D
2007-06-16 03:20:09 · answer #3 · answered by sam 1 · 0⤊ 0⤋
you should try marking out the points... if the lines are parallel, they should have the same gradient, M. if they are perpendicular, their gradients should multiply together to get
-1.
2007-06-16 03:14:29 · answer #4 · answered by Anonymous · 0⤊ 0⤋