Long description: fig7a

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A graph showing a parabola opening upwards with a labeled focus point at (0, a) on the y-axis.

Alt text: A graph showing a parabola opening upwards with a labeled focus point at (0, a) on the y-axis.

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  • The image displays a Cartesian coordinate system with an x-axis and a y-axis.
  • A parabola is graphed on the coordinate system, opening upwards and having its vertex at the origin (0, 0).
  • A point labeled "focus" is marked on the y-axis at the coordinates (0, a), indicating the focus of the parabola.
  • Lines connect the label "focus" to this marked point, and the axes are labeled with "x" and "y", respectively.

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