Mathematics
Junior High
この問題の解き方、？がついている＋4とはどういう意味か教えてください！
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次の連立方程式を代入法で解きなさい。
リ= 2x -1.①
x+ 4y=14·②
[解)
①をのに代入して
x+4(2.x-1) =14
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