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What do you know about the slopes of perpendicular lines?

y = - 3x + 18

i used a program called geogebra.

how did u get that

Geogebra

http://www.geogebra.org/cms/

Programs are good, but its important to know how to do it by hand.

I know i found it
but I dont want to use it

Ok, do you want me to help you?

It is very simple yo use. They even provide help for you too solve these kind of probelms.

Yes I need your help Brittni0605

Ok, so what do you know about the slopes of perpendicular lines?

you have to multiply them by -1

rite? idk

No can u be a little clear on that?

So you mean B mutiply 3 *-1/3

i got 3 because its the slope isnt it?

|dw:1355586908724:dw|

Okay whats the slope then
wait you need to find the slope first rite?

Yes.

slope is 3

rite?

No, its not 3. Show me your work.

okay

|dw:1355587318034:dw|

Your work is correct. But you said the slope is 3. Your work shows something different.

oh sorry its negative 3
thanks for showing that

\[-3 *1/3\]

rite?

wait what about the points (-6,7)

wiat whats the slope of the perspendicular then

*perpendicular

Perpendicular slope is the negative reciprocal of the slope of your line

so the slope of my line is -3
that means my perpendicular slope is -3 *1/3
rite?

No, you're not multiplying anything.

so my perpendicular lines slope is 1/3 rite

Yes.

so do i substitute with y=mx+b

Yes.

can u check my work???/

Yes, ill check your work.

okay imm attach it

Ok.

Nevermind my computers having problems?

Umm, ok