Number of values of k for which pair of linear equations 7x – y = 5 and 21x – 3y = k have unique solutions (A) 0 (B)1 (C) inf

1 thought on “Number of values of k for which pair of linear equations 7x – y = 5 and 21x – 3y = k have unique solutions (A) 0 (B)1 (C) inf”

1. your question is wrong check it .

   instead of unique solutions parallel will come

   a1/a2=b1/b2≠c1/c2

   7/21=1/3≠ 5/k

   1/3≠ 5/k

   k≠15

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