Answer :

[tex]4x-5y=20 \\ -5y=-4x+20\\ y=\frac{4}{5}x-4[/tex]

It's [tex]\frac{4}{5}[/tex]
[tex]4x-5y=20 \\ 5y=20-4x \\ y=(4x-20)/5 \\ y= \frac{4}{5} x-4 \\ \\ The answer is 4/5.[/tex]

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