primul
2x-3y=5 2x=5+3y 2x=5+3y 2x=5+3y 2x=5+3y
x+y=10/2 <=>2x+2y=20 <=> 5+3y+2y=20 <=> 5(1+y)=20 <=> 1+y=4 <=>
2x=5+3y 2x=5+9 2x=14 x=7
y=3 <=> y=3 <=> y=3 <=> y=3
al doilea
x-y=1 x=y+1 x=y+1 x=y+1 x=y+1 x=9/4
3x+2y=7 <=> 3x+2y=7 <=> 3y+3+2y=7 <=>5y=4 <=> y=5/4 <=> y=5/4
sper ca te am ajutat