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OpenStudy (anonymous):
X1+X2-X3+X4=2 X1-X2+X3+X4=-1 X1+X2+X3-X4=2 X1+X3+X4=-1 solve using cramer's rule.
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OpenStudy (anonymous):
cramer's rule are for 2 by 3s i think, this requires Gauss elimination
OpenStudy (anonymous):
A Mathematics solution with comments is attached.
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