\(mx-2ny=-3\) đúng ko nhỉ?
Do d đi qua (-5;6) nên: \(-5m-12n=-3\)
Kết hợp với \(4m-5n=3\) ta được hệ:
\(\left\{{}\begin{matrix}4m-5n=3\\-5m-12n=-3\end{matrix}\right.\) \(\Leftrightarrow\left\{{}\begin{matrix}m=\dfrac{5n+3}{4}\\5m+12n=3\end{matrix}\right.\)
\(\Leftrightarrow\left\{{}\begin{matrix}m=\dfrac{5n+3}{4}\\5\left(\dfrac{5n+3}{4}\right)+12n=3\end{matrix}\right.\)
\(\Leftrightarrow\left\{{}\begin{matrix}m=\dfrac{5n+3}{4}\\73n=-3\end{matrix}\right.\) \(\Leftrightarrow\left\{{}\begin{matrix}n=-\dfrac{3}{73}\\m=\dfrac{51}{73}\end{matrix}\right.\)
\(mx-2ny=???\) ghi thiếu đề rồi em