![\Delta= \left[\begin{array}{cc}2&-1\\3&2\end{array}\right] =4+3=7\\ \Delta_1= \left[\begin{array}{cc}1&-1\\12&2\end{array}\right] =2+12=14\\ \Delta_2= \left[\begin{array}{cc}2&1\\3&12\end{array}\right] =24-3=21\\\\ \left \{x= \dfrac{\Delta_1}{\Delta} = \dfrac{14}{7} =2} \atop { y= \dfrac{\Delta_2}{\Delta} = \dfrac{21}{7} =3} \right ](/tpl/images/0288/2240/b9cc2.png)
Solve using determinant
2x-1=1
3x+2y=12
and prove by graph...
Answers: 1
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