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X² + z² = 7 Write an equation for the cross section at y = -7 using x and z.

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Final answer:

The equation for the cross section at y = -7 is x² + z² = 7, which represents a circle with center at the origin (0, 0) and radius √7.

Step-by-step explanation:

To find the equation for the cross section at y = -7, we need to substitute y with -7 in the given equation x² + z² = 7.

So, the equation becomes x² + z² = 7.

This equation represents a circle with center at the origin (0, 0) and radius √7.

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