｛x-y=-3.7x+5y=0.
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｛x-y=-3.7x+5y=0.｛x-y=-3.7x+5y=0.｛x-y=-3.7x+5y=0.x-y=-3→x＝y－3.代入7x+5y=0.得7﹙y－3﹚＋5y＝0y＝7／4x＝y－3＝7／4－3＝
｛x-y=-3.7x+5y=0.
｛x-y=-3.7x+5y=0.
｛x-y=-3.7x+5y=0.
x-y=-3 → x＝y－3.代入7x+5y=0.得 7﹙y－3﹚＋5y＝0
y＝7／4
x＝y－3＝7／4－3＝－5／4
｛x-y=-3.7x+5y=0.
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