Question: Distance between two parallel planes

So I am taking multi variable calculus this semester and we have been asked to use maple to complete an assignment. I have never used maple before so I tried to read the tutorial we were given. Anyway, it was written by some incompetent fool as I am now more confused than when I started. The concepts are appallingly illustrated and I have no idea what to do. I have attempted to do most questions and I will probably get part marks for most, but I am completely clueless regarding this one. The Question is as follows: "Determine the distance from the plane 2x + y - z = 1 to the plane 2x + y - z = 6" No idea where to begin as I know nothing about using maple. I would imagine something along the lines of finding a line that intersects both perpendicularly and finding the distance along that... but in maple I'm pretty clueless. I know the material okay, but am just lost when it comes to the syntax... and can't seem to find anything on the web that is helpful.
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