Question

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Answer 1

$1)+\left \{ {{2x+y=11} \atop {3x-y=9}} \right.\\ -------\\5x=20\\\\x=4\\\\y=11-2x=11-2*4=11-8=3\\\\Otvet:\boxed{(4;3)}$

$2)+\left \{ {{x-3y=4} \atop {5x+3y=-1}} \right.\\ --------\\6x=3\\\\x=0,5\\\\3y=x-4=0,5-4=-3,5\\\\y=-1\frac{1}{6} \\\\Otvet:\boxed{(0,5;-1\frac{1}{6})}$

$3)-\left \{ {{x+5y=7} \atop {x-3y=-1}} \right.\\ --------\\8y=8\\\\y=1\\\\x=3y-1=3*1-1=2\\\\Otvet:\boxed{(2;1)}$