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OpenStudy (anonymous):
Solve the system of equations x+y-z=-1 x+y+z=3 3x-2y-z=-4
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OpenStudy (anonymous):
do you know how to start? Hint: use addition on the first two.
OpenStudy (anonymous):
I tried elimination with it, but couldn't get it to work
OpenStudy (anonymous):
never mind, i didn't understand it because of a mistake in me reading my own writing, I got it now :p
OpenStudy (phi):
try doing it this way http://www.khanacademy.org/math/algebra/algebra-matrices/reduced_row_echelon/v/matrices--reduced-row-echelon-form-2
OpenStudy (anonymous):
Love khan academy! @phi
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