Question

Why isn't D the right answer? Because from my understanding whenever a question asks you for a horizontal asymptote, you plug in both + and - infinity.

Answer 1

Explanation:

lim(x→-∞) 5x / (1 − x) = -5

lim(x→∞) 5x / (1 − x) = -5

y = 5x / (1 − x) only has a horizontal asymptote at y = -5.