Răspunsuri

2014-10-28T21:41:26+02:00
Daca z=x+2y atunci y-3(x+2y)=4 <=> y-3x-6y=4 <=> -5y=4+3x <=> y=-(4+3x)/5
-(4+3x)/5-3x+2*-(4+3x)/5=4 <=> -4-3x-8-6x=20 <=> -24x=8 <=> x=-1/3
=> y=-3/5