# Do this by substituting Cartesian coordinates, x and y, for the polar coordinates, r and θ,showing that it has form for a parabola, x = ay^2 + by + c

Show that for eccentricity equal to one in Equation 13.10 for conic sections, the path is a parabola. Do this by substituting Cartesian coordinates, x and y, for the polar coordinates, r and θ , and showing that it has the general form for a parabola, $$\displaystyle{x}={a}{y}^{{2}}+{b}{y}+{c}$$ .

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