本题目来源于试卷: Rational Functions，类别为 IB数学
[问答题]
Let $ f(x)=\frac{9-12 x}{c x-20}$ , for $x \neq \frac{20}{c}$ , where $c \neq 0 $.
1. The line x=5 is a vertical asymptote to the graph of y=f(x) .
1. Find the value of c .
2. Write down the equation of the horizontal asymptote to the graph of y=f(x) .
2. The line y=h , where $h \in \mathbb{R}$ , intersects the graph of y=|f(x)| at exactly one point. Find the possible values of h .
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