Mathematics
8 Online
OpenStudy (anonymous):
passes through (6,1) and (8,-5)
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OpenStudy (saifoo.khan):
equation?
OpenStudy (anonymous):
yes
hero (hero):
I'm tired of doing these
OpenStudy (saifoo.khan):
\[\Huge y = -3x+19\]
hero (hero):
I don't know how school teachers do this year after year
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OpenStudy (saifoo.khan):
ask them
OpenStudy (anonymous):
is there anyway you could possibly explain that to me so i can try the other ones on my own?
hero (hero):
That's what he should have done anyway
OpenStudy (saifoo.khan):
do you know how to find the slope?
OpenStudy (anonymous):
mx+b right?
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OpenStudy (saifoo.khan):
No.
OpenStudy (anonymous):
then idk what im doing
OpenStudy (saifoo.khan):
use the formula:
\[slope =\frac{y_2-y_1}{x_2-x_1}\]
OpenStudy (saifoo.khan):
remember that?
OpenStudy (anonymous):
yes i do!
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OpenStudy (saifoo.khan):
plug in the values to find the slope.
OpenStudy (anonymous):
soo.. my slope would be -6/2?
OpenStudy (precal):
yes your slope is -3. By the way, school teachers love to repeat themselves. Mathematics is the study of patterns.
hero (hero):
I think you mean repetition in this case
OpenStudy (saifoo.khan):
-6/2 = -3
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OpenStudy (precal):
Yes, it is part of the job.
OpenStudy (anonymous):
okay, so once i find -3, what do i do?
OpenStudy (precal):
use y=mx+b
m=-3 slope is -3
use (6,1) x=6 y=1 either point given will work
y=mx+b
1=(-3)(6)+b
1=-18+b
19=b
equation is y=-3x+19
OpenStudy (anonymous):
thank you so much!!
OpenStudy (precal):
Anytime :)