Answers
Answers
①x=3y+5y
②x≦3y+5
①の式を②に代入する
(xに代入)
↓
3y+5y≦3y+5
↓
(右辺の3yを左辺に移項)
↓
3y+5y-3y≦5
↓
(左辺を計算)
↓
5y≦5
↓
(両辺5で割る)
↓
y≦1
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