Tahmina
can some one please help me with this::



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

Brittni0605
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What do you know about the slopes of perpendicular lines?

Fox375
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y =  3x + 18

Fox375
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i used a program called geogebra.

Tahmina
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how did u get that

Fox375
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Geogebra


Brittni0605
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Programs are good, but its important to know how to do it by hand.

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

Brittni0605
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Ok, do you want me to help you?

Fox375
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It is very simple yo use. They even provide help for you too solve these kind of probelms.

Tahmina
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Yes I need your help Brittni0605

Brittni0605
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Ok, so what do you know about the slopes of perpendicular lines?

Tahmina
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you have to multiply them by 1

Tahmina
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rite? idk

Brittni0605
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Umm, sort of on the right track. Perpendicular lines have slopes that are negative reciprocals. Do you know what that means?

Tahmina
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No can u be a little clear on that?

Tahmina
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So you mean B mutiply 3 *1/3

Tahmina
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i got 3 because its the slope isnt it?

Brittni0605
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dw:1355586908724:dw

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

Brittni0605
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Yes.

Tahmina
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slope is 3

Tahmina
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rite?

Brittni0605
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No, its not 3. Show me your work.

Tahmina
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okay

Tahmina
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dw:1355587318034:dw

Brittni0605
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Your work is correct. But you said the slope is 3. Your work shows something different.

Tahmina
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oh sorry its negative 3
thanks for showing that

Brittni0605
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No prob. SO, now that you know the slope of your line is 3, what is the slope of its perpendicular line?

Tahmina
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\[3 *1/3\]

Tahmina
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rite?

Tahmina
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wait what about the points (6,7)

Brittni0605
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No, remember if the slope of your line is 6, the slope of its perpendicular line is the negative reciprocal (1/6)

Tahmina
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wiat whats the slope of the perspendicular then

Tahmina
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*perpendicular

Brittni0605
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Perpendicular slope is the negative reciprocal of the slope of your line

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

Brittni0605
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No, you're not multiplying anything.

Tahmina
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so my perpendicular lines slope is 1/3 rite

Brittni0605
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Yes.

Tahmina
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so do i substitute with y=mx+b

Brittni0605
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Yes.

Tahmina
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can u check my work???/

Brittni0605
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Yes, ill check your work.

Tahmina
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okay imm attach it

Brittni0605
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Ok.

Tahmina
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Nevermind my computers having problems?

Brittni0605
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Umm, ok