Answers
２ａ＋(－3ｂ)＝－２...①
２ｃ＋５(－3)＝３...②
３ａ＋(－５ｂ)＝－２...③
②を解くとｃ＝９です
①③から
６ａ＋(－９ｂ)＝－６...①×３
６ａ＋(－１０ｂ)＝－４...③×２
よりｂ＝－２，ａ＝－４
ではないでしょうか？
Were you able to resolve your confusion?
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