Q.
The system of equations2x+6y+11=0, 6y−18z+1=0, 6x+20y−6z+3=0is
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a
consistent
b
has unique solution
c
inconsistent
d
cannot be determined
answer is C.
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Detailed Solution
We have, augmented matrix AD=260-1106-18-1620-6-3 R3→R3-3R1 ~260-1106-18-102-630 R3→3R3-R1 ~260-1106-18-100091 Here rank A=2 and rank AD=3 ⇒ rank A≠rank AD ⇒The given system of equations is inconsistent.
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