Answer
The two lines are perpendicular.
Work Step by Step
We put each in slope-intercept form:
$Ax +By = C \\ y = \frac{-A}{B}x +\frac{C}{B}$
For equation two:
$Bx -Ay = D \\ y = \frac{B}{A}x +\frac{-D}{A}$
The slopes are opposite reciprocals, the two lines are perpendicular.
