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Find the vertex of the graph of the equation x - y^2 + 8y = 13.

 Jul 18, 2020
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x = y^2 -8y + 13     this is a sideways parabola

    the y value of the vertex is found by   = b / 2a   where   a = 1  and   b = -8

      use this value of y in the equation to find the x coordinate of the vertex

 Jul 18, 2020

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