1. Solve all three:
a. Determine whether the plane 2x + y + 3z – 6 = 0 passes through the points (3,6,-2) and (-1,5,-1)
b. Find the equation of the plane that passes through the points (2,2,1) and (-1,1,-1) and is perpendicular to the plane 2x - 3y + z = 3.
c. Determine whether the planes are parallel, orthogonal, or neither. If they are neither parallel nor orthogonal, find the angle of intersection:
3x + y - 4z = 3 and -9x - 3y + 12z = 4
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