Question

The line through the origin perpendicular to the line x-3y=9 (write an equation of the line described)

Answer 1

you have f(0)=0
and you want to find the line perpendicular to x-3y=9

Note that perpendicular lines have slopes that are -1/m, if m is the slope of the original line.

Answer 2

thanks, I am having trouble working this out, can you help me?

Answer 3

write the equation for the line you're given in terms of y, so it looks like y=blah blah

Answer 4

(move everything by y to the right side of the equation)

Answer 5

this is what I got -3y=9-x

Answer 6

divide both sides by -3

Answer 7

y=x/3-3

Answer 8

what is the slope?

Answer 9

i got 1/3

Answer 10

ok, so if m=1/3 what is -1/m?

Answer 11

im not sure... that's what im confused on