x+y=92 x:y=2y+8 Oblicz x i y Zadanie dotyczy układu równań

x=120 y=-28

x+y=92 x:y=2y+8 x=92-y x:y=2y+8 x=92-y 92-y:y=2y+8 x=92-y -y:y-2y=-92+8 x=92-y -1-2y=-86 x=92-y -2y=-86+1 x=92-y -2y=-85 x=92-y -2y=-85 /:(-2) x=92-y y=42.5 x=92-42.5 y=42.5 x=49.5 y=42.5