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x = y + 1
Subtitusi ke
x^2 -5x -y + 4 =0
(y+1)^2 -5(y+1) -y +4 =0
y^2 +2y +1-5y-5-y+4=0
y^2 -4y = 0
y (y-4) = 0
y = 0,4
x = 1,5
Jadi (1,0)&(5,4)