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0.4x+0.5y=2.5

1.2x-3.5y=2.5




ELIMINATION BY USING MULTIPLICATION

Sagot :

Lilithidn
[tex]\begin{cases} 0.4x+0.5y=2.5\ \ /*7 \\ 1.2x-3.5y=2.5\end{cases} \\ \\ \begin{cases} 2.8x+3.5y=17.5 \\ 1.2x-3.5y=2.5\end{cases}\\ +\ \ -------- \\4x=20 \ \ /:4\\ \\x=5[/tex]

[tex]0.4x+0.5y=2.5\\ \\ 0.4*5+0.5y=2.5\\ \\2+0.5y=2.5\ \ | -2\\ \\0.5y=2.5-2\\ \\0.5y=0.5 \ \ :/ \ 0.5\\ \\ y=1 \\ \\ \begin{cases}\ \x=5 \\ y=1 \end{cases}[/tex]


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