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25 February, 22:40

To begin deriving the equation of the line y = 6x, Matt drew a triangle with vertices (0,0), (1,0), and (1,6). A similar triangle with which of these vertices would allow him to continue with his derivation?

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  1. 25 February, 23:06
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    In this case we have that y = 6x, then the triangle that you need to do is the one with vertices at:

    (0,0), (x, 0), (x, y (x))

    in this case, Matt used x = 1, and y (x) = 6*1 = 6

    then we have that the vertices are:

    (0,0), (x, 0), (x, y (x))

    but if you use other value of x you can find another triangle that also can be usefull to find the derivate:

    x = 2

    the vertices will be:

    (0,0), (2,0), (2, 2*6 = 12)

    now, you can find the slope (and the tangent line = derivate) by the equation:

    f' = (y (2) - y (1)) / (2 - 1)
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