Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Equations of slope?

  1. Feb 15, 2009 #1
    What is the defining equation of the concept of slope?

    I thought it could be rise / run = m or Y2-Y1 / X2-X1 = m but then the next question asks to give the two common forms of the mathematical equation for slope involving X and Y? So would that not be those two equations?
  2. jcsd
  3. Feb 15, 2009 #2
    I would say the the equation they are looking for would be:

    Slope/gradient (m) = y2-y1 / x2-x1

    Not sure what the other one would be...Unless you're doing calculus in which case it could be the derivative (slope) at a particular point.

    eg. f'(x) = 2x^2 + 1 at the point where x=2

    Therefore you have both your 'x' value and 'y' value because technically f(x) = y

    Hope that helped...
  4. Feb 15, 2009 #3
    sin or tan of the angle of slope are both commonly used
  5. Feb 15, 2009 #4


    User Avatar
    Staff Emeritus
    Science Advisor
    Homework Helper

    Sometimes the Greek letter Δ is used to signify the change in a quantity or variable. That might be what they are looking for.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook