If two planes intersect each other, the curve of intersection will always be a line. To find the symmetric equations that represent that intersection line, you’ll need the cross product of the normal vectors of the two planes, as well as a point on the line of intersection.

Read MoreIf two planes intersect each other, the intersection will always be a line. The vector equation for the line of intersection is calculated using a point on the line and the cross product of the normal vectors of the two planes.

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