podany układ rozwiąż algebraicznie i graficznie : y=3x+1 y=-2x-4
y=3x+1 y=-2x-43x+1 = -2x -43x +2x = -4 -15x = -5 /: 5x = -1y= 3*(-1) +1 = -3 + 1 = -2x= -1y = -2
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y=3x+1
y=-2x-4
3x+1 = -2x -4
3x +2x = -4 -1
5x = -5 /: 5
x = -1
y= 3*(-1) +1 = -3 + 1 = -2
x= -1
y = -2