Question

Решить географическую систему уравнений .
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Answer 1

$2)\left \{ {{y=-3x} \atop {y-x=-4}} \right.\\\\\left \{ {{y=-3x} \atop {-3x-x=-4}} \right. \\\\\left \{ {{y=-3x} \atop {-4x=-4}} \right.\\\\\left \{ {{y=-3*1} \atop {x=1}} \right.\\\\\left \{ {{y=-3} \atop {x=1}} \right.\\\\Otvet:\boxed{(1;-3)}$

$4)\left \{ {{y=3x} \atop {4x-y=3}} \right.\\\\\left \{ {{y=3x} \atop {4x-3x=3}} \right.\\\\\left \{ {{y=3*3} \atop {x=3}} \right.\\\\\left \{ {{y=9} \atop {x=3}} \right.\\\\Otvet:\boxed{(3;9)}$