Answer:
m = 1
b = -4
Explanation:
The "slope-intercept form" of the equation for a line is often written ...
y = mx + b
The x-coefficient, m, is the slope of the line. The constant, b, is the y-intercept.
Comparing the slope-intercept form to your equation, we see that ...
m = 1
b = -4
_____
The slope is the ratio of "rise" to "run" for the graph. Here, that means the line goes through the point (0, -4), the y-intercept, and rises 1 unit for each 1 unit to the right of that point. For example, the point (4, 0) will also be on the line. (It is right 4 units and up 4 units from the y-intercept.)
The equation can be graphed by entering it into a graphing tool, or by plotting two points on the line and drawing a line through them.