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NDA 2013
Exam
NDA
Year
2013
Subject
Mathematics
Chapter
Determinants

NDA 2013 · Mathematics · Determinants

For what value of k , the equations 3 x-y=8 and 9 x-k y=24 will...

For what value of kk, the equations 3x−y=83 x-y=8 and 9x−ky=249 x-k y=24 will have infinitely many solutions?

Options

  1. A66
  2. B55
  3. C33
  4. D11

Correct answer

C. 33

Step-by-step solution

For infinite solution 39=−1−k=824\frac{3}{9}=\frac{-1}{-k}=\frac{8}{24} k=3
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