Question

{3х - 5у = 11
{2х + у = 3

Answer 1

$\displaystyle \left \{ {{3x-5y=11} \atop {2x+y=3}} \right.\\\\ \left \{ {{3x-5y=11} \atop {y=3-2x}} \right.\\\\ 3x-5(3-2x)=11\\3x-15+10x=11\\13x-15=11\\13x=11+15\\13x=26\\x=2\\y=3-2*2\\y=3-4\\y=-1\\(x,y)=(2,-1)$