Question

Giải pt:\(\left\{{}\begin{matrix}2x-7y=0,5\\3x+y=1\end{matrix}\right.\)

Answer 1

y = \(\dfrac{1}{46}\)

x = \(\dfrac{15}{16}\)

 

 

Answer 2

đề ???

Answer 3

\(\left\{{}\begin{matrix}2x-7y=0,5\\3x+y=1\end{matrix}\right.\)

\(\Leftrightarrow\) \(\left\{{}\begin{matrix}2x-7y=0,5\\21x+7y=7\end{matrix}\right.\)

\(\Leftrightarrow\) \(\left\{{}\begin{matrix}23x=7,5\\3x+y=1\end{matrix}\right.\)

\(\Leftrightarrow\) \(\left\{{}\begin{matrix}x=\dfrac{15}{46}\\y=1-3x\end{matrix}\right.\)

\(\Leftrightarrow\) \(\left\{{}\begin{matrix}x=\dfrac{15}{46}\\y=1-3\cdot\dfrac{15}{46}\end{matrix}\right.\)

\(\Leftrightarrow\left\{{}\begin{matrix}x=\dfrac{15}{46}\\y=\dfrac{1}{46}\end{matrix}\right.\)