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What is the slope of the line described by the equation below?

y - 9 = -2(x - 8)

  • math -

    first put it in slope intercept form

    y=mx +b
    m is the slope and b will give you the y intercept

    y-9 = -2(x-8)

    multiply everyting in the parenthesis by -2

    y-9= -2x + 16

    and then plus 9 from both side

    y= -2x + 25

    your slope is -2

  • math -

    the equation is in the form
    y - y1 = m(x - x1) where (x1, y1) is a point and m is the slope.
    By the "just-looking-at it" principle, the slope is -2

    (and a point on it is (8,9) )

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