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OpenStudy (anonymous):
Solve, the following system of equations by linear combination: 2d + e = 8 d - e = 4
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OpenStudy (ash2326):
add the two equations 2d+e+(d-e)=8+(4) 3d=12 d=4 use this in first equation 2d+e=8 d=4 2*4+e=8 e=0 so d=4 and e=0
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