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miss Akunina [59]
3 years ago
5

Solve the system of equations by graphing 4x-5y=20

Mathematics
2 answers:
borishaifa [10]3 years ago
5 0
Here is your graph of the system. Where they cross is the answer, which is -4. Pretty much you have to graph each equation and where they meet is the answer.

Ede4ka [16]3 years ago
4 0
And doing some vandalizing to the posted image by MathJot, check the picture below.

\bf \begin{cases}
4x-5y=20\\
3x+y=-4
\end{cases}\\\\
-------------------------------\\\\
4x-5y=20\implies 4x-20=5y\implies \cfrac{4x-20}{5}=y\\\\\\ \boxed{\cfrac{4x}{5}-4=y}
\\\\\\
3x+y=-4\implies \boxed{y=-4-3x}

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