Răspunsuri

2014-09-04T17:51:09+03:00
3x=2y-4
9x²=(2y-4)²
inlocuind
(2y-4)²-4y²=20
4y²-16y+16-4y²=20
-16y=4
y=-1/4
3x=-1/2-4=-9/2
x=-3/2
atunci
3x+2y=-3.3/2-2/4=-5