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Solve the following system of equations:
$\frac{2}{x}\ +\ \frac{3}{y}\ =\ 2$
$\frac{4}{x}\ –\ \frac{9}{y}\ =\ -1$
Given:
The given system of equations is:
$\frac{2}{x}\ +\ \frac{3}{y}\ =\ 2$
$\frac{4}{x}\ –\ \frac{9}{y}\ =\ -1$
To do:
We have to solve the given system of equations.
Solution:
Let $\frac{1}{x}=u$ and $\frac{1}{y}=v$
This implies,
The given system of equations can be written as,
$\frac{2}{x}\ +\ \frac{3}{y}\ =\ 2$
$2u+3v=2$-----(i)
$\frac{4}{x}\ -\ \frac{9}{y}\ =\ -1$
$4u-9v=-1$
$4u=9v-1$
$u=\frac{9v-1}{4}$
Substitute $u=\frac{9v-1}{4}$ in equation (i), we get,
$2(\frac{9v-1}{4})+3v=2$
$\frac{9v-1}{2}+3v=2$
Multiplying both sides by $2$, we get,
$2(\frac{9v-1}{2})+2(3v)=2(2)$ 
$9v-1+6v=4$ 
$15v=1+4$
$15v=5$ 
$v=\frac{5}{15}$
$v=\frac{1}{3}$
This implies,
$u=\frac{9(\frac{1}{3})-1}{4}$
$u=\frac{3-1}{4}$
$u=\frac{2}{4}$
$u=\frac{1}{2}$
$x=\frac{1}{u}=\frac{1}{\frac{1}{2}}=2$
$y=\frac{1}{v}=\frac{1}{\frac{1}{3}}=3$ 
Therefore, the solution of the given system of equations is $x=2$ and $y=3$.