In Example 3(b), change −9y to 7y.

Data from Example 3(b)

The parabola 2x² = −9y fits the form of Eq. (21.16) if we write it in the form

Here, we see that 4 p = −9/2. Therefore, its axis is along the y-axis, and its vertex is at the origin. Because 4 p = −9/2, we have

The parabola opens downward, as shown in Fig. 21.48.

Transcribed Image Text:

x² || 9 2