Answer: slope = 0
Explanation:
The equation of straight line can be expressed in the form y = mx + b, which is referred to as slope intercept form.
In this equation, m represents the slope of the line, y is the y-coordinate of an arbitrary point along the line and x is the x-coordinate of the same point, and b is the location where the line intercepts the y-axis of the graph.
if y = 16, then the slope of the line, m, must be 0.
y = mx + b
y = (0)x + b
y = b
In other words, the line described by the equation y = 16 is a horizontal line that passes through the y-axis at the point (0,16).