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## Homework Statement

Two planes have equations

2x-y-3z=7

x+2y+2z=0

Find a vector equation for their line of intersection

## The Attempt at a Solution

I haven't learnt the vector product in class but read it and attempted it and got the direction vector 4i-7j+5k.

However, I don't know how to get the position vector of this.

Thank you for your help and time