(1) 50x+100y＝1000
x+y＝14
これを連立させて、
50x+100y＝1000
50x+50y＝700
>>>>x＝8、y＝6
(2) 3x+2y＝530
2x+3y＝570
これを連立させて、
6x+4y＝1060
6x+9y＝1710
>>>>x＝90y＝130
ですかね？
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