Question

Sketch the graph of the equation f(x)= 2x/x-4

Answer 1

vertical asymptote at
\[x=4\] horizontal at
\[y=2\]

Answer 2

draw those two lines. now if you want to cheat, just graph it using calculator or wolfram alpha. if not, then pick some number greater than 4 and check what region you are in. likewise for a number less than 4. then there will only be one way to draw the picture respecting the two asymptotes.