Algebra

(-1,4) and (5,8) is (x1,y1) and (x2,y2). The slope is m=(y2-y1)/(x2-1). Substitute and evaluate to find the slope.

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  1. Just do what it says ....
    m = (8-4)/(5 - (-1))
    =

    finish it up.

    btw, your formula conains a typo, should say
    m = (y2-y1)/(x2-x1)

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