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OpenStudy (anonymous):
20) What does z equal in the solution of the system of equations below? 6x-7z=13 8y+2z=14 7x+z=6 a)-2 b)2 c)-1 d)1
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OpenStudy (amistre64):
x = (6-z)/7 ; Eq3 6x -7z = 13 ; Eq1 6(6-z)/7 -7z = 13 36 -6z -49z = 91 55z = 55 z = 1 ... d
OpenStudy (amistre64):
ack!!..typoed
OpenStudy (amistre64):
-55z = 55 z = -1 ; which is c
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