faci sistem dintre
{2/3*x+4/5*y=-1
1/5*x-1/4*y=4}
amplifici la acelasi numitor.
vei obtine
{10*x+12*y=-15
4*x-5*y=80}
prima ecuatie o inmultesti cu -2 si a doua cu 5;
obtii:
{-20*x-24*y=30
20*x-25*u=400}
adunam cele 2 ecuatii. prin adunate se simplifica x
-24*y-25*y=430
=>-29*y=430
=>y=-430/29
4*x-5*y=80
=>4*x=80+5*(-430\29)
=>4*x=170/29
=>x=170/(29*4)
=>x=85/58
