Answer:
It has no slope
Explanation:
It has no slope. Slope equations are in the form y=mx + b. The "m" is the slope and the "b" is the y-intercept (the y-intercept is the point on the y-axis that the line goes through.). So since your equation is y=-4, there is not slope given, only the y-intercept which means it is a flat line that goes through -4 on the y-axis. I hope that helped.