Answer
(a) slope $m=0$, y-intercept $b=4$.
(b) See graph.
(c) $0$.
(d) constant.
Work Step by Step
(a) Given $y=4$, we can determine the slope $m=0$, y-intercept $b=4$.
(b) This is a horizontal line passing $(0,4)$. See graph.
(c) The average rate of change is the same as the slope, thus $R=m=0$.
(d) The linear function is constant.
