Odpowiedzi

2009-11-30T14:47:38+01:00
5(x-3y) = -7(3y-x)
-3(x+4)+2(3-5y)=0
5x - 15y = -21y - 7x / ×3
-3x+16x + 6 - 10y =0 / (-5)
15x - 45y = -63y - 21x
15x- 80x + 30 - 50y = 0