[" 4.For which value of "a" ,the system ...

[" 4.For which value of "a" ,the system of "],[" equation "2x+3y=7;(a-1)x+],[(a+1)y=3a+1" represent parallel line: "],[[" (a) "a=-5," (b) "a=10],[" (c) "a!=5," (d) "a=5]]

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