Question

va rog mult ,dau coroană ,e urgent!​

Answer 1

$\left \{ {{3x+7y=5} \atop {5x-2y=-19}} \right.$

${3x+7y=5$  $| * 5$

$5x-2y= - 19$  $| * 3$

$...............................$.....

$15x + 35y=25$

$15x-6y= -57$            $( - )$

$........................................$

$/$    $35 y -(-6y) = 25-(-57)$

    $41 y = 82$

    $y=\frac{81}{41}$

   $y=2$

$3x+7y=5$

$3x+7 * 2 = 5$

$3x+14=5$

$3x=5-14$

$3x= -9$

$x=\frac{-9}{3}$

$x= -3$

$\left \{ {{x=-3} \atop {y=2}} \right.$