Решением каких систем является пара чисел (-5;2):
1)[tex] \left \{ {{7x+2y=31} \atop {4x-5y=-30}} \right. [/tex]
2)[tex] \left \{ {{3y-2x=16} \atop {6x+7y=-16}} \right. [/tex]
3)[tex] \left \{ {{x-2y=-9} \atop {10y-x=15}} \right. [/tex]
1)[tex] \left \{ {{7x+2y=31} \atop {4x-5y=-30}} \right. [/tex]
2)[tex] \left \{ {{3y-2x=16} \atop {6x+7y=-16}} \right. [/tex]
3)[tex] \left \{ {{x-2y=-9} \atop {10y-x=15}} \right. [/tex]
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