I need to submit this in a couple of hours. Any assistance would be very much appreciated

Due Sunday by 11:59pm Points 100 Submitting a file upload 1. Prove that distance between plane ax+by+cz+d=0 and point (x1.y1,z1) is lax1+by1+cz1+d|/(a^2+b^2+c^2)^(1/2)