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Write the equation of a line that is: perpendicular to 9x + 3y = 15 and goes through the point (-6, 7)
What do you know about the slopes of perpendicular lines?
y = - 3x + 18
i used a program called geogebra.
how did u get that
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
Umm, sort of on the right track. Perpendicular lines have slopes that are negative reciprocals. Do you know what that means?
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?
Okay whats the slope then wait you need to find the slope first rite?
slope is 3
No, its not 3. Show me your work.
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
No prob. SO, now that you know the slope of your line is -3, what is the slope of its perpendicular line?
wait what about the points (-6,7)
No, remember if the slope of your line is -6, the slope of its perpendicular line is the negative reciprocal (1/6)
wiat whats the slope of the perspendicular then
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
so do i substitute with y=mx+b
can u check my work???/
Yes, ill check your work.
okay imm attach it
Nevermind my computers having problems?