①:6x+8y=55.②:3x+8y=30.

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①:6x+8y=55.②:3x+8y=30.①:6x+8y=55.②:3x+8y=30.①:6x+8y=55.②:3x+8y=30.①-②得:3x=55.8-30.3;x=8.5x=8.5代入②得:8

①:6x+8y=55.②:3x+8y=30.
①:6x+8y=55.②:3x+8y=30.

①:6x+8y=55.②:3x+8y=30.
①-②得:3x=55.8-30.3; x=8.5
x=8.5代入②得:8.5×3+8y=30.3,y=0.6