Find the angle between the plane $-3 x+ y - 3 z = -3$ and the plane $3 x+ 5 y = 2$.

$\theta =$ degrees.

Notes: The angle between two planes is always less than or equal to $90^\circ$.
If you use arccos( ) or acos( ) within WeBWorK, it will return a value in radians. Convert to degrees.