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The z intercept occurs when x=y=0. Picture the z axis coming up from the floor. A good example is the corner of a room, The x-y plane is the floor and the z axis the the line coming up from the floor, perpendicular to it. This is the corner of the room. Now when would something intersect that line? It would happen when x=0 and y=0 If the equation is 5x-2y-4z-3=0 setting x and y to zero yields -4z-3=0 or 4z=-3 so z=-3/4

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