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Math Help - Another Slope Question

  1. #1
    Member ~berserk's Avatar
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    Another Slope Question

    I'm sorry for all of the questions but i am just lost, I'm thinking that our teacher did not explain this well enough to us. But I have two questions.

    Find a number "t" such that the line passing through the 2 given points has a slope of -2.

    (t+1,5) (6,-3t+7)


    Use slopes to show the points (-4,6) (-1,12) and (-7,0)all lie on the same straight line.

    For these I just would like a setup so I can learn how to do these myself
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  2. #2
    Moo
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    Hi !
    Quote Originally Posted by ~berserk View Post
    For these I just would like a setup so I can learn how to do these myself
    okay then

    1/ equation of a line : y=ax+b, where a is the slope

    2/ if a line passes through 2 points, then the coordinates of these two points satisfy the equation of the line.

    Is it enough ?

    3/ To prove that 3 points lie on the same line, it is sufficient to prove that the line between 1st and 2nd point and the one between 2nd and 3rd (or 1st and 3rd) have same slope.

    Is it enough again ?
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