Question

Show that a line through (0, 0) and (c, d) is perpendicular to a line through (0, 0) and (-d, c).

Slope of first line =

Slope of second line =
REALLY DONT UNDERSTAND THIS...

Answer 1

Slopes..

Answer 2

how can i do it with numbers!!!!!!!

Answer 3

its harder

Answer 4

for perpendicular lines, use:
m1 * m2 = -1

Answer 5

Like let's say the slope of a line is 2.
then the perpendicular line will have,

m1 * m2 = -1
2 * m2 = -1
m2 = -1/2

Answer 6

so.. let me guess the answers are either c/d or -d/c

Answer 7

slope of first line