Answer
(a) The slope is -4, and the y-intercept is (0,3)
(b) The average rate of change is -4
(c) The function is decreasing since the slope is negative.
(d) See below.
Work Step by Step
The function is in the form of y=mx+b.
$m$ is the slope of the function and, also, the average rate of change (in linear functions slope and the average rate of change are the same).
$b$ is the y-intercept.
A linear function increases when its slope is positive, it decreases when its slope is negative, and it's constant when its slope is zero.
