Cant remember how to use formula

  • Thread starter lostit
  • Start date
  • #1
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Cant remember how to use formula !!!

i cant for the life of me remember which way to do this formula someone please show me the light,,,,,
to find the slope(m) of the line you have y2 - y1 / x2 - x1 am i right then getting the result (m) you use this formula y=mx+c
taking y1 for y and x1 for x ,
now heres my question
we have c = (m)(x) is it - y or is it /y

thanks for your replys in advance..
 

Answers and Replies

  • #2
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[tex] m = \frac{y_{2}-y_{1}}{x_{2}-x_{1}} [/tex] [tex] y = mx+c [/tex] then [tex] c = y_1-mx_1 [/tex]
 
Last edited:
  • #3
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y=mx + c is the equation of the line. Here x and y are coordinates of any point on that line.
(y2-y1)/(x2-x2) will give you the slope m. Here x1 y1, x2 y2 are coordinates of two particular points.
Your question makes no sense, as c is not equal to (m)(x)
 
  • #4
radou
Homework Helper
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courtrigrad said:
[tex] m = \frac{y_{2}-y_{1}}{x_{2}-x_{1}} [/tex] [tex] y = mx+c [/tex] then [tex] c = y-mx [/tex]

[tex]c = -mx_{1}+y_{1}[/tex].
 

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