Given the -coordinate of a point on a plane
and the angle the plane makes with the horizontal,
could the equation of the plane be established?
I would say: No.
Visualize a "pup tent".
Code:* / * P / o / * / * / / \ / / \ / / \ \ * / * \ * / * \ * / * \ * / *\ * *
The two sloping sides make the same angle with the horizontal
. . and both sides contain the point