## College Algebra (6th Edition)

$0$
$$\frac{2x+y}{xy-2x}$$ for $x=-2$ and $y=4$ $$=\frac{2\times(-2)+4}{(-2)\times4-2\times(-2)}$$ a negative times a negative gives a positive: $$=\frac{(-4)+4}{(-8)+4}$$ $$=\frac{0}{(-4)}$$ $$=0$$