Toán Lớp 9: Trong mptd Oxy cho A(2,3) B(7,7) viết pt đoạn thẳng AB
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Toán Lớp 9: Trong mptd Oxy cho A(2,3) B(7,7) viết pt đoạn thẳng AB
Comments ( 1 )
\left\{ \begin{array}{l}
2a + b = 3\\
7a + b = 7
\end{array} \right.\\
\to \left\{ \begin{array}{l}
5a = 4\\
2a + b = 3
\end{array} \right.\\
\to \left\{ \begin{array}{l}
a = \dfrac{4}{5}\\
b = \dfrac{7}{5}
\end{array} \right.
\end{array}\)