50 БАЛЛОВ ДАЮ!!!!Решите графическим способом систему:
1) { х+у=0
{3х+2у=-2;
2) {х+у=7,
{-х+2у=-4;
3) { х+2у=4,
{-1,5х+у=6;
4) {х-у=-2,
{5х-2у=2.

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