E. Graphical Method; 1. 2x-3y=7;3x+y=5 2. 2x-5y=9;3x+4y=25
1.{2x−3y=73x+y=52x−3y=7x25y−113x+y=5x21y−121.\\ \left\{ \begin{matrix}2x-3y=7\\ 3x+y=5\end{matrix}\right.\\ 2x-3y=7\\ \begin{matrix} x &2 &5 \\ y & -1&1 \end{matrix}\\ 3x+y=5\\ \begin{matrix} x &2 &1 \\ y & -1&2 \end{matrix}\\1.{2x−3y=73x+y=52x−3y=7xy2−1513x+y=5xy2−112
(2,−1)(2,-1)(2,−1)
2.{2x−5y=93x+4y=252x−5y=9x2−3y−1−33x+4y=25x73y142.\\ \left\{ \begin{matrix}2x-5y=9\\ 3x+4y=25\end{matrix}\right.\\ 2x-5y=9\\ \begin{matrix} x &2 &-3 \\ y & -1&-3 \end{matrix}\\ 3x+4y=25\\ \begin{matrix} x &7 &3 \\ y & 1&4 \end{matrix}\\2.{2x−5y=93x+4y=252x−5y=9xy2−1−3−33x+4y=25xy7134
(7,1)(7,1)(7,1)
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