zad1.rozwiąż metoda przeciwnych wspólczynnikow
a) x-3y=4
5x+3y=-1
b) 2x+5y=25
4x=3y=15
c) 6x-7y=40
5y-2x=-8
d) 7x-3y+1=0
4x-5y+17=0
zadanie.2
a) 9x- 1/3y =-12
3x+y=6
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