Answer:
Explanation:
1) Since this function is f(x)=mx+b, whose rule is:

2) Then this parameter m is a negative one, the line is a decreasing one (from upper left to lower right). Then Let's choose three random values for x, and plug it in the function, to get y values. Let x, be 0,1,2.
The parameter b is 4 then the line crosses the y-axis in point (0,4).
3) Plugging it in, goes:

As we have three coordinate points, we can trace a line:
(0,4),(1,3.75),(2,3.5)