can some one please help me with this::

- anonymous

can some one please help me with this::

- katieb

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- anonymous

Write the equation of a line that is:
perpendicular to 9x + 3y = 15 and goes through the point (-6, 7)

- anonymous

What do you know about the slopes of perpendicular lines?

- anonymous

y = - 3x + 18

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## More answers

- anonymous

i used a program called geogebra.

- anonymous

how did u get that

- anonymous

Geogebra

- anonymous

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

- anonymous

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

- anonymous

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

- anonymous

Ok, do you want me to help you?

- anonymous

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

- anonymous

Yes I need your help Brittni0605

- anonymous

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

- anonymous

you have to multiply them by -1

- anonymous

rite? idk

- anonymous

Umm, sort of on the right track. Perpendicular lines have slopes that are negative reciprocals. Do you know what that means?

- anonymous

No can u be a little clear on that?

- anonymous

So you mean B mutiply 3 *-1/3

- anonymous

i got 3 because its the slope isnt it?

- anonymous

|dw:1355586908724:dw|

- anonymous

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

- anonymous

Yes.

- anonymous

slope is 3

- anonymous

rite?

- anonymous

No, its not 3. Show me your work.

- anonymous

okay

- anonymous

|dw:1355587318034:dw|

- anonymous

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

- anonymous

oh sorry its negative 3
thanks for showing that

- anonymous

No prob. SO, now that you know the slope of your line is -3, what is the slope of its perpendicular line?

- anonymous

\[-3 *1/3\]

- anonymous

rite?

- anonymous

wait what about the points (-6,7)

- anonymous

No, remember if the slope of your line is -6, the slope of its perpendicular line is the negative reciprocal (1/6)

- anonymous

wiat whats the slope of the perspendicular then

- anonymous

*perpendicular

- anonymous

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

- anonymous

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

- anonymous

No, you're not multiplying anything.

- anonymous

so my perpendicular lines slope is 1/3 rite

- anonymous

Yes.

- anonymous

so do i substitute with y=mx+b

- anonymous

Yes.

- anonymous

can u check my work???/

- anonymous

Yes, ill check your work.

- anonymous

okay imm attach it

- anonymous

Ok.

- anonymous

Nevermind my computers having problems?

- anonymous

Umm, ok

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