Step 1 :The function given is a logarithmic function. The general form of a logarithmic function is \(f(x) = log_b(x-h) + k\), where \(b\) is the base of the logarithm, \(h\) is the horizontal shift, and \(k\) is the vertical shift. The asymptote of a logarithmic function is the vertical line \(x = h\). In this case, the function is \(f(x) = log_2(-x) + 4\), so there is a reflection about the y-axis (because of the negative sign in front of \(x\)), and the asymptote is \(x = 0\).
Step 2 :The graph of the function is a reflection of the graph of \(f(x)=log _{2}(x)+4\) about the y-axis, and it is shifted 4 units upwards.
Step 3 :Two points with integer coordinates on the graph are (-1, 5) and (-2, 4).
Step 4 :\(\boxed{\text{Final Answer: The asymptote of the function } f(x)=log _{2}(-x)+4 \text{ is } x=0.}\)