Toán Lớp 10: / 3x -2y =18
[
\ X +4y = -13
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Toán Lớp 10: / 3x -2y =18
[
\ X +4y = -13
Comments ( 2 )
<=>$\begin{cases} 3x-2y=18\\3x+12y=-39\\ \end{cases}$
<=>$\begin{cases} -14y=57\\x+4y=-13\\ \end{cases}$
<=>$\begin{cases} y=\frac{-57}{14}\\x+4.\frac{-57}{14}=-13\\ \end{cases}$
<=>$\begin{cases} y=\frac{-57}{14}\\x+(\frac{-144}{7})=-13\\ \end{cases}$
<=>$\begin{cases} y=\frac{-57}{14}\\x=-13-\frac{-144}{7}\\ \end{cases}$
<=>$\begin{cases} y=\frac{-57}{14}\\x=\frac{23}{7}\\ \end{cases}$
Vậy hệ phương trình có nghiệm là x = \frac{23}{7} ; y = \frac{-57}{14}