Mathematics
Senior High
③はx=12、y＝7のときに成り立つというところはどのようにして出ますか？
8x-13y=5
③はx=12,y=7のとき成り立つから
8・12-13・7=5
③ ④ より
-
8(x-12)-13 (y-7)=0
(3)
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