Answer:
perpendicular
Explanation:
Two lines are perpendicular if their slopes are negative reciprocals.
we need to find the slopes of both lines.
for QR, Q(-6, 11) and R(2, -1)
the slope of QR is -3/2.
for ST, S(-4, 8) and T(-1, 10)
the slope of ST is 2/3.
-3/2 is the negative reciprocal of 2/3
QR and ST are perpendicular