The points (1, 5) and (−3, 7) correspond to the POINTS (1, 5, 1) and (−3, 7, 1). Their LINE of intersection is (1, 5, 1) x (−3, 7, 1) =
[−2, −4, 22]. In turn, this LINE is the plane
−2*x* − 4*y* + 22z = 0, and so corresponds to the line
−2*x* − 4*y* + 22 = 0.