4x-2y=1.5(1) 3y-5.5x=2.5(2)
由(1)得,
y=(4x-1.5)÷2=2x-0.75
代入(2)得,
3(2x-0.75)-5.5x=2.5；6x-2.25-5.5x=2.5；0.5x=4.75；x=9.5
y=9.5×2-0.75=18.25
x=9.5；y=18.25