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Mathematics 17 Online
OpenStudy (anonymous):

What is the nature of intersection of these three planes: 5x+3y-z=11 -2x-7y+10z=2 6x+21y-30z=-6 I know that the answer is two coincident planes and the other one intersecting in a line. my question is how would you know that the first equation intersects in a line? Would you use elementary operations?

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