Mathematics
Junior High
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答えはa＝－2なのですが問題文の意味もなぜこうなるかも分かりません💦めっちゃわかりやすく教えて欲しいです。
□(5) 2直線x+y=6, x+ay=-6が直線y=2x上で交わるとき, αの値を求めなさい。
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