Determine which two equations represent perpendicular lines.
(a) y = 2x – 9
(b) y = 1/2x + 9
(c) y = -1/2x + 9
(d) y = 1/2x -9
2007-04-05 11:24:00 · 4 answers · asked by materialtam 1 in Science & Mathematics ➔ Mathematics
a and c
- - - - - - s-
2007-04-05 12:27:08 · answer #1 · answered by SAMUEL D 7 · 0⤊ 0⤋
A and C are perpindicular.......the key thing about perpindicular lines is that their slopes are the negative reciprocal, so the reciprocal of 2 is 1/2, and the negative of that is -1/2, so A and C are perpindicular
2007-04-05 11:31:38 · answer #2 · answered by ajfmf90 2 · 0⤊ 0⤋
Perpendicular lines have slopes that are opposite reciprocals. Their y intercepts cannot be the same, though.
Thus, a and c are perpendicular.
2007-04-05 11:36:43 · answer #3 · answered by Evil Genius 3 · 0⤊ 0⤋
a) and c)
The slope of one line is the negative reciprocal of the slope of the line perpendicular to it.
2007-04-05 11:31:09 · answer #4 · answered by calculusgirl1979 2 · 0⤊ 0⤋