Hi, I totally forgot how to do line and slope, can someone help me out???

- anonymous

Hi, I totally forgot how to do line and slope, can someone help me out???

- katieb

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- anonymous

how do you want to be helped? do you have example problems?

- anonymous

Well, the first point on the graph is 1,2, the second is 0,-2

- anonymous

okay do you know how to find the slope of the line given two points?

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## More answers

- anonymous

no, that's why I'm here

- anonymous

mmk, i'm just asking

- anonymous

formula for slope is
change in y over change in x

- anonymous

so slope would be
(-2 -2) / (0 - 1)
which comes out to be 4
so the slope is four

- anonymous

oh, I get it now, I was looking online, but everything was too comlicated, thanks for the help

- anonymous

now we have the formula for a line
y = mx + b
where m is the slope and b is the intercept
put slope in
y = 4x + b
we are also given two points, since both points are on the line, you can pick either
say we pick the first one, plug it in for x and y
2 = 4(1) + b
b = -2
line is
y = 4x - 2

- anonymous

sure thing

- anonymous

that works, okay, that totally helps with homework, I'm glad i found this site

- anonymous

cheers

- anonymous

thanks for the help

- anonymous

no problem

- anonymous

alright, i have another question

- anonymous

hello????????

- anonymous

go ahead

- anonymous

so if the equation is (3,-2), (0,-3) then u would switch it around to (0,-2), (3,-3)????

- anonymous

??????

- anonymous

just because we are live, doesn't mean we are going to respond instantly
you can't switch them because you would be changing the points

- anonymous

then wat? I don't get it then.

- anonymous

then you find the slope, like we did in the first question
change in y over change in x

- anonymous

i still don't understand, i'm only in 7th grade

- anonymous

the question is find a line between (3,-2), (0,-3)
so find the slope
change in y over change in x
(-3 - -2)/ (0 - 3)
slope is 1/3
understand this?

- anonymous

wait, so its kinda like subtracting

- anonymous

yes
slope formula is
\[\frac{x1 - x2}{y1 - y2}\]
is this more clear?

- anonymous

i totaly get it now, OH, we did this last year in school, thanks!!!! (:

- anonymous

lol no problem
good luck

- anonymous

thanks

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