Question

{-2X+3Y=4
{2X-5Y=2
METODA REDUCERII

Answer 1

$\left\{\begin{matrix} - 2x + 3y = 4\\ 2x - 5y = 2\end{matrix}\right.$

$- 2x + 2x + 3y - 5y = 2 + 4$

$- 2y = 6 \: | \div ( - 2)$

$y = - 3$

$2x - 5y = 2$

$2x - 5 \times ( - 3) = 2$

$2x + 15 = 2$

$2x = 2 - 15$

$2x = - 13$

$x = - \frac{13}{2}$

$x = - 6.5$