posted by j .
6. Find out if the line r = (1, 3, 8) + t (-2, 5, 7) is parallel to the plane 3x + 4y - 2z = 1
if the line is parallel to the plane, then the line must be
perpendicular to the normal of the plane
test if the dot product between [-2,5,7] and [3,4,-2] is zero.