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Find the page perpedicular to the plane x+3y-z-7=0 and containing the points (2,0,5) and (0,2,-1).

The answer given in the book is 2x-y-z+1=0. But when I plotted x+3y-z-7=0 and 2x-y-z+1=0, by a PC runnig Maple, they don't look perpendicular to each other.

Thanks