Hope I can still remember how It is done:

1. Find the normal vectors of the two planes. These can be computed from the coefficients in the plane equations.

2. Compute the cross product of the two normal vectors to get a vector parallel to the line of intersection.

3. Normalize the cross product vector to get a unit vector parallel to the line of intersection.

4. Choose a point that lies on both planes and use it along with the unit vector to compute the equation of the line of intersection in the form:

point + t * unit_vector

Where t is a parameter.

So in summary, you need the plane equations, find their normals, take the cross product, normalize, and then use a point on the intersection and the unit vector to get the line equation.
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