(1)
3x+y=7 ①
x+2y=9 ②
① ×2
6x+2y=14 ① ’
①-② ②に代入
6x+2y=14 1+2y=9
-) x+2y=9 2y=9-1
－－－－－－ 2y=8
5x =5 y=4
x=1
x=1 y=4
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