[填空题]
A rational function is defin y f+r/s4wv8v.r t.bone e5m:kubk3fg+ psg8yeo29c :ud by $ f(x)=a+\frac{b}{x-c}$ , for $x \neq c$ , where a, b, c $\in \mathbb{Z}$. The following diagram represents the graph of y=f(x) .
Using the information on the graph,
1. state the value of a and the value of c ; a = c =
2. find the value of b . b =