Find the points of intersection of the line x = 3 + 2t, y = 5 + 8t, z = −6 + t, that is, l(t) = (3 + 2t, 5 + 8t, −6 + t), with the coordinate planes. xy plane (x, y, z) = xz plane (x, y, z) = yz plane (x, y, z) =