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0 votes
19.9k views
in Linear Equations by (41.0k points)
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For what value of k, the system of equations kx – y = 2, 6x – 2y – 3 has infinitely many solutions ? 

A) k = 2 

B) k = 3

C) k = 1 

D) Does not exists

2 Answers

+1 vote
by (57.0k points)
selected by
 
Best answer

Correct option is (D) Does not exists

Given system of equations is

kx – y = 2

\(\Rightarrow\) kx - y - 2 = 0    _________(1)

6x – 2y – 3 = 0    _________(2)

By comparing given system with standard form of system, we get

\(a_1=k,b_1=-1,c_1=-2\)

and \(a_2=6,b_2=-2,c_2=-3\)

\(\therefore\) \(\frac{a_1}{a_2}=\frac k6,\)

\(\frac{b_1}{b_2}=\frac{-1}{-2}=\frac12\)

\(\frac{c_1}{c_2}=\frac{-2}{-3}=\frac23\)

\(\because\) \(\frac12\neq\frac23\)

\(\therefore\) \(\frac{b_1}{b_2}\neq\frac{c_1}{c_2}\)

But condition for infinitely many solutions is

\(\frac{a_1}{a_2}=\frac{b_1}{b_2}=\frac{c_1}{c_2}\) which is not possible.

Hence, for any value of k, the given system never give infinitely many solutions.

Hence, the value of k does not exists.

+1 vote
by (37.4k points)

Correct option is D) Does not exists

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