Question

3х-20у=11 х+6у=10 все это под системой

Answer 1

$<var>\left \{ {{x+6y=10} \atop {3x-20y=11 }} \right. \left \{ {{x=10-6y} \atop {3(10-6y)-20y=11}} \right. \left \{ {{x=10-6y} \atop {30-18y-20y=11}} \right. \left \{ {{x=10-6y} \atop {-38y=-19}} \right. \left \{ {{x=7} \atop {y=0,5}} \right. </var>$

Ответ: (7;0,5)