A) \[m+n=7,3m+3n=21\]
B) \[5x-7y,6x-3y=8\]
C) \[x-3y=18,-x-y=11\]
D) \[9x+y=-2,8x-2y=0\]
Correct Answer: A
Solution :
(a): Trivial Method In (a): see that one equation is a multiple of another; \[\therefore 3\times (m+n-7)=3m+3n=21\]
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