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5x - y = 2
x + 3y = -4
x=-4-3y
5(-4-3y)-y=2
-20-15y-y=2
-16y=22
y=-1⅜
x=-4-3*(-1⅜)
x=-4+4⅛
x=⅛
b)metoda przeciwnych współczynników
5x - y = 2|*3
x + 3y = -4
15x-3y=6
x + 3y = -4
-------------
16x=2
x=⅛
5*⅛-y=2
-y=2-⅝
-y=1⅜
y=-1⅜