1.) x - y + z = 3 x + y + z = 7 x + y - z = -1 Thanks to those who help!
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row1-row2 gives -2y=-4 so y=2 row1+row3 gives 2x=2 so x=1 plug these x and y values in to any row, say row 3 1+2-z=-1 so z=4 check that they satisfy the other two also
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