Question

Система уравнений х-у=13 5х+2у=3

Answer 1

Ответ:

$\displaystyle\left \{ {{x-y=13} \atop {5x+2y=3}} \right.$

$x=13+y$

$5*(13+y)+2y=3\\65+5y+2y=3\\7y=3-65\\7y=-62\\y=-\dfrac{62}{7}$

$x=13-\dfrac{62}{7} =\dfrac{91}{7} -\dfrac{62}{7} =\dfrac{29}{7}$