The viewer needs to pay special attention to the a. The a tells you if it is above or below. The viewer must also pay atention to the k because that is the asymptote. The viewer must pay attention to y=k, meaning that there are no x-value restrictions, so the domain is all real numbers. Also, the viewer must pay attention to the asymptote because the range depends on that. Another thing is that the viewer must pay attention and understand why there is no x-intercept.
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