Mathematics for IGCSE & O level - Sketching Curves (Section 3 - No. 32)
What effect does a vertical shift of an exponential function have on its horizontal asymptote?
It moves the asymptote upwards.
It moves the asymptote downwards.
It doesn't affect the asymptote.
It moves the asymptote horizontally.
Explanation
Vertical translations shift the horizontal asymptote by that same number of units.