Toán Lớp 9: 2) Cho (d) : y = (2m – 3) x + 7 , (d’): y = 3x + 1. Tìm m để d // d’
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Toán Lớp 9: 2) Cho (d) : y = (2m – 3) x + 7 , (d’): y = 3x + 1. Tìm m để d // d’
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Đáp án
#andy
\[\begin{array}{l}
de\,\,d\parallel d’\\
\Rightarrow \left\{ \begin{array}{l}
2m – 3 = 3\\
7 \ne 1\left( {luon\,\,dung} \right)
\end{array} \right. \Leftrightarrow 2m – 3 = 3 \Leftrightarrow m = 3
\end{array}\]