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Solve the following pairs of equations:
$ \frac{1}{2 x}-\frac{1}{y}=-1 $
$ \frac{1}{x}+\frac{1}{2 y}=8, x, y ≠0 $
Given:
\( \frac{1}{2 x}-\frac{1}{y}=-1 \)
\( \frac{1}{x}+\frac{1}{2 y}=8, x, y ≠ 0 \)
To do:
We have to solve the given pairs of equations.
Solution:
$\frac{1}{2 x}-\frac{1}{y}=-1$........(i)
$\frac{1}{x}+\frac{1}{2 y}=8$........(ii)
Put $\frac{1}{x}=u$ and $\frac{1}{y}=v$ in equations (i) and (ii), we get,
$\frac{1}{2} u-v=-1$
$\Rightarrow \frac{u-2 v}{2}=-1$
$\Rightarrow u-2 v=-2$.....(iii)
From equation (ii),
$u+\frac{1}{2} v=8$
$\Rightarrow \frac{2 u+v}{2}=8$
$2u+v=16$......(iv)
Multiplying (iv) by 2 and adding the result with (iii), we get,
$u-2v+2(2u+v)=-2+2(16)$
$u+4u-2v+2v=-2+32$
$5u=30$
$u=6$
This implies,
$6-2v=-2$
$2v=6+2$
$v=\frac{8}{2}$
$v=4$
Therefore,
$x=\frac{1}{u}=\frac{1}{6}$
$y=\frac{1}{v}=\frac{1}{4}$
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