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For the pair of equations
$ \lambda x+3 y=-7 $
$ 2 x+6 y=14 $
to have infinitely many solutions, the value of $ \lambda $ should be 1 . Is the statement true? Give reasons.
Given :
The given pair of equations is,
\( \lambda x+3 y=-7 \)
\( 2 x+6 y=14 \)
To find :
We have to find whether the value of \( \lambda \) is 1.
Solution:
We know that,
The condition for infinitely many solutions is,
$\frac{a_1}{a_2}=\frac{b_1}{b_2}=\frac{c_1}{c_2}$
\( \lambda x+3 y+7=0 \)
\( 2 x+6 y-14=0 \)
Here,
$a_1=\lambda, b_1=3, c_1=7$
$a_2=2, b_2=6, c_2=-14$
Therefore,
$\frac{a_1}{a_2}=\frac{\lambda}{2}$
$\frac{b_1}{b_2}=\frac{3}{6}=\frac{1}{2}$
$\frac{c_1}{c_2}=\frac{7}{-14}=-\frac{1}{2}$
This implies,
$\frac{\lambda}{2}=\frac{1}{2}$
$\lambda=1$
$\frac{\lambda}{2}=-\frac{1}{2}$
$\lambda=-1$
Here,
$\lambda$ does not have a unique value.
Hence, for no value of $\lambda$ the given pair of linear equations has infinitely many solutions.
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