Question

решите систему уравнений {3x+5y=11
{5x-2y=10

Answer 1

$left { {{3x+5y=11 } atop {5x-2y=10}} right. \ left { {{6x+10y=22 } atop {25x-10y=50}} right. \ 31x=72 \ x= frac{72}{31} \ 3*frac{72}{31}+5y=11 \ frac{216}{31}+5y=11 \ 5y=11-6 frac{30}{31} \ 5y=4 frac{1}{31} \ y= frac{125}{31}:5 \ y= frac{25}{31}$