Line QR contains (2, 8) and (3, 10) Line ST contains points (0, 6) and (-2, 2). Lines QR and ST are (4 points)
Select one:
a. parallel because the product of the slopes is -1
b. perpendicular because the product of the slopes is -1
c. parallel because the slopes are the same
d. perpendicular because the slopes are the same