Answer
(a) See graph (red curve).
(b) domain $(-\infty,\infty)$, range $(-\infty,\infty)$.
(c) decreasing on $(-\infty,\infty)$.
Work Step by Step
(a) To graph $y=-\frac{2}{5}x+4$, find two points on the line $(0,4),(5,2)$, then connect the points. See graph (red curve).
(b) We can determine the domain $(-\infty,\infty)$, range $(-\infty,\infty)$.
(c) The function is decreasing on $(-\infty,\infty)$, increasing on $none$.
