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Can anyone give me some hints on the problem? I've looked in my textbook, but I don't know what "s" means. I found stuff on the parametric vector form, and it gives me the equation x = su + tv, but I don't see any "t"'s in this problem.

I first tried setting up an augmented matrix with

[ 1 1 0 0 | -3 ]

[ 0 1 1 0 | -3 ]

[ 0 0 1 1 | -4 ]

[ 1 0 0 1 | -4 ]

And I solved for the four variables, like:

x

_{1}= -3 - x

_{2}

x

_{2}= -3 - x

_{3}

x

_{3}= -4 - x

_{4}

x

_{4}= -4 - x

_{1}

And now I'm stumped. I didn't think these would do anything, but setting the first and second rows equal to each other, and the third and fourth rows equal to each other simply gets x

_{1}- x

_{3}= 0 for both of them.

I didn't think this would do anything either, but I tried also back substituting the x

_{1}equation into the x

_{4}equation, and then the x

_{2}equation into x

_{4}, and so on, and that ended up with x

_{4}= x

_{4}.