anonymous
  • anonymous
can some one please help me with this::
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
Write the equation of a line that is: perpendicular to 9x + 3y = 15 and goes through the point (-6, 7)
anonymous
  • anonymous
What do you know about the slopes of perpendicular lines?
anonymous
  • anonymous
y = - 3x + 18

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anonymous
  • anonymous
i used a program called geogebra.
anonymous
  • anonymous
how did u get that
anonymous
  • anonymous
Geogebra
anonymous
  • anonymous
http://www.geogebra.org/cms/
anonymous
  • anonymous
Programs are good, but its important to know how to do it by hand.
anonymous
  • anonymous
I know i found it but I dont want to use it
anonymous
  • anonymous
Ok, do you want me to help you?
anonymous
  • anonymous
It is very simple yo use. They even provide help for you too solve these kind of probelms.
anonymous
  • anonymous
Yes I need your help Brittni0605
anonymous
  • anonymous
Ok, so what do you know about the slopes of perpendicular lines?
anonymous
  • anonymous
you have to multiply them by -1
anonymous
  • anonymous
rite? idk
anonymous
  • anonymous
Umm, sort of on the right track. Perpendicular lines have slopes that are negative reciprocals. Do you know what that means?
anonymous
  • anonymous
No can u be a little clear on that?
anonymous
  • anonymous
So you mean B mutiply 3 *-1/3
anonymous
  • anonymous
i got 3 because its the slope isnt it?
anonymous
  • anonymous
|dw:1355586908724:dw|
anonymous
  • anonymous
Okay whats the slope then wait you need to find the slope first rite?
anonymous
  • anonymous
Yes.
anonymous
  • anonymous
slope is 3
anonymous
  • anonymous
rite?
anonymous
  • anonymous
No, its not 3. Show me your work.
anonymous
  • anonymous
okay
anonymous
  • anonymous
|dw:1355587318034:dw|
anonymous
  • anonymous
Your work is correct. But you said the slope is 3. Your work shows something different.
anonymous
  • anonymous
oh sorry its negative 3 thanks for showing that
anonymous
  • anonymous
No prob. SO, now that you know the slope of your line is -3, what is the slope of its perpendicular line?
anonymous
  • anonymous
\[-3 *1/3\]
anonymous
  • anonymous
rite?
anonymous
  • anonymous
wait what about the points (-6,7)
anonymous
  • anonymous
No, remember if the slope of your line is -6, the slope of its perpendicular line is the negative reciprocal (1/6)
anonymous
  • anonymous
wiat whats the slope of the perspendicular then
anonymous
  • anonymous
*perpendicular
anonymous
  • anonymous
Perpendicular slope is the negative reciprocal of the slope of your line
anonymous
  • anonymous
so the slope of my line is -3 that means my perpendicular slope is -3 *1/3 rite?
anonymous
  • anonymous
No, you're not multiplying anything.
anonymous
  • anonymous
so my perpendicular lines slope is 1/3 rite
anonymous
  • anonymous
Yes.
anonymous
  • anonymous
so do i substitute with y=mx+b
anonymous
  • anonymous
Yes.
anonymous
  • anonymous
can u check my work???/
anonymous
  • anonymous
Yes, ill check your work.
anonymous
  • anonymous
okay imm attach it
anonymous
  • anonymous
Ok.
anonymous
  • anonymous
Nevermind my computers having problems?
anonymous
  • anonymous
Umm, ok

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