I know how to tell when the planes are parallel, but not perpendicular, if anyone could help out.
Determine whether the planes are perpendicular:
3x - y + z - 4 = 0;
x + 2z = -1
Another one,
Determine whether the line and plane are perpendicular:
x = -2 -4t
y = 3 - 2t
z = 1 + 2t
2x + y - z = 5
Any help is greatly appreciated!