Решите системы уравнений графическим методом:
а)
{ у-5х=0 у=х-4 ;
б){у+3х=1 х+у=5 ;
в){х+у=9 х-у=1 ;
г) {-3х+у=0 -4х+у=2;
д){х-у=2 2х-2у-6=0 ​
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