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JEE Main 20137 April
Exam
JEE Main
Year
2013
Date
7 April
Subject
Mathematics
Chapter
Determinants

JEE Main 2013 · 7 April · Mathematics · Determinants

The number of values of k , for which the system of equations : (k...

The number of values of kk, for which the system of equations :

\left(k + 1\right)x + 8y = 4k</p><p></p><p>kx + \left(k + 3\right)y = 3k - 1$

has no solution, is :

Options

  1. A22
  2. B33
  3. CInfinite
  4. D11

Correct answer

D. 11

Step-by-step solution

For a1x+b1y=c1anda2x+b2y=c2{a}_{1}x + {b}_{1}y = {c}_{1}anda2x + {b}_{2}y = {c}_{2} to have no solution,

a1a2=b1b2≠c1c2\dfrac{{a}_{1}}{{a}_{2}} = \dfrac{{b}_{1}}{{b}_{2}} \ne \dfrac{{c}_{1}}{{c}_{2}}

∴k+1k=8k+3≠4k3k−1∴ \dfrac{k + 1}{k} = \dfrac{8}{k + 3} \ne \dfrac{4k}{3k - 1}

\left(k + 1\right)\left(k + 3\right) = 8k ⇒ {k}^{2} - 4k + 3 = 0</p><p></p><p>⇒ k = 1, 3</p><p>but,for</p><p>but, fork = 1, \dfrac{8}{k + 3} = \dfrac{4k}{3k - 1}</p><p></p><p>∴ k = 3$

Hence, only one value

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