Mathematics
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OpenStudy (linn99123):
What is the slope of the line that passes through the points (–2, 15) and (–8, –5)?
A.) -10/3
B.) -5/2
C.) 5/2
D.)10/3
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undeadknight26 (undeadknight26):
-5 - (-15)/-8 - (-2)
OpenStudy (anonymous):
Just remember the rule when you add two negatives together
OpenStudy (solomonzelman):
Why do you use the second point as (x1,y,2) instead of the first ;) Doesn't matter, just curious.
OpenStudy (solomonzelman):
I mean (x,1,y1)
OpenStudy (anonymous):
Yes, I have learned it y2-y1 / x2-x1
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OpenStudy (anonymous):
(x1, x2), (y1), y2)
undeadknight26 (undeadknight26):
@SolomonZelman i get 10/-6...where did i go wrong mate?
OpenStudy (solomonzelman):
ggg
\[15-(-5)=20~~~~~~~-5-15=-20\]
OpenStudy (anonymous):
how did you get -6?
OpenStudy (solomonzelman):
either way ...
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OpenStudy (anonymous):
-8 - (-2)
OpenStudy (anonymous):
oh, I answered my own question
OpenStudy (solomonzelman):
yes, so it is ±20 going whichever way...
undeadknight26 (undeadknight26):
-8 - -2 = -6...and ohhh...
i did -5 - -15 lolz
OpenStudy (solomonzelman):
yes, and that's where you got confused, because the 15 is positive in the coordinate.
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OpenStudy (anonymous):
it is easy to make an error when you are doing the subtraction
OpenStudy (anonymous):
but I find if you write it out with the - in () then you can just change it a plus
OpenStudy (solomonzelman):
it is (-2,15) , NOT (-2,-15)
undeadknight26 (undeadknight26):
Yeah i saw that lolz...
OpenStudy (solomonzelman):
good :)
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OpenStudy (anonymous):
is there a way to field questions into another subject? there is a lot of questions all over the place, biology, chemistry, etc...
OpenStudy (anonymous):
I feel like I am helping others in multiple subjects in a math community
OpenStudy (linn99123):
i have no clue wat yall just did i tryed to figure it out but still didnt get the answer
OpenStudy (linn99123):
Its B?
undeadknight26 (undeadknight26):
-5 - 15/ -2 - -8
-20/-6 = -10/3
I would say A
am i right @SolomonZelman
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OpenStudy (anonymous):
you would have -20/6 right?
OpenStudy (anonymous):
-2 - - 8 = -2 + 8 = 6
OpenStudy (solomonzelman):
Yes, undeadknight, it's A