Originally Posted by

**sqleung** ...

__Two vectors a and b are the normals to two planes. Both of these planes pass through (0,0,0). Vector OP = t[a x b] where t is a scalar.__

**1. Describe the set of all points P in relation to the two distinct planes**

For this one, can somebody perhaps explain it in "simpler" terms because I'm rather confused on the wording of it. : All points P form the intersection line between the two planes. See attachment.

**2. From above or otherwise, find the parametric equations of the line of intersection between the two planes**

5x + 2y - z = 0

3x + y + 4z = 0

Okay, first, I got the direction vectors of the two equations which are [5,2,-1] and [3,1,4]. ... **OK**

From there, I cross-producted these two vectors to get [7,-17,-1] wrong [9, -23, -1]

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