Answer
$(x,y)=(\dfrac{1}{5},\dfrac{3}{10})$
Work Step by Step
Cramer's rule states that
$a x+b y=p \\ cx+dy=q$
$\triangle=\left|\begin{array}{ll}{a}&{b}\\{c}&{d}\end{array}\right|, \triangle_{1}=\left|\begin{array}{ll}{p}&{b}\\{q}&{d}\end{array}\right|, \triangle_{2}=\left|\begin{array}{ll}{a}&{p}\\{c}&{q}\end{array}\right|$; $ x=\dfrac{\triangle_1}{\triangle}; y=\dfrac{\triangle_2}{\triangle} (D\displaystyle \neq 0)$
From the given system of equations, we have:
$ \left[\begin{array}{ll} a& b\\c & d \end{array}\right]=\left[\begin{array}{ll}
3 & -2\\ 5 & 10 \end{array}\right]$ and$\left[\begin{array}{l}
p\\q \end{array}\right]=\left[\begin{array}{l}0\\ 4 \end{array}\right]$
$\begin{array}{cccccc} \triangle =& & \triangle_{1} =& & \triangle_{2} = \\\left|\begin{array}{ll} 3 & -2\\ 5 & 10
\end{array}\right|= & & \left|\begin{array}{ll} 0 & -2\\
4 & 10 \end{array}\right|= & & \left|\begin{array}{ll}
3 & 0\\ 5 & 4 \end{array}\right|=\\
=30+10 & & =0+8& & =12-0 \\=40(\ne 0) & & =8 & & =12\\ & & & & \end{array}$
So, $x= \dfrac{\triangle_{1}}{\triangle}=\dfrac{8}{40}=\dfrac{1}{5}$ and $y=\dfrac{\triangle_{2}}{\triangle}=\dfrac{12}{40}=\dfrac{3}{10}$
Thus, our solution is: $(x,y)=(\dfrac{1}{5},\dfrac{3}{10})$