The foot of the perpendicular drawn from the origin to a plane is the point (1,-3, 1). What is the intercept cut on the x-axis by the plane?

[d] Equation of plane passing through (1,−3,1) and whose normal (1,−3,1)is 1(x−1)−3(y+3)+1(z−1)=0 ⇒x−3y+z−11=0 ⇒x11−y11/3+z11=0 The above plane intercept the x-axis at 11.