Forwards and Backwards

DIRECTIONS
Replace the right hand sides of [math]x_1\left(t\right)[/math], [math]y_1\left(t\right)[/math], [math]x_2\left(t\right)[/math], and [math]y_2\left(t\right)[/math]so that [math]P_1[/math] moves left to right along the parabola segment, while [math]P_2[/math] moves right to left.

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