The general expression for any straight line is:
Where:
• m is the slope of the line
,
• b is the y-axis intercept
In this case, we have a straight line with equation
Meaning that the slope of such line is 0, and the y-axis intercept is -4.
in fact, it is a horizontal line that passes through y=-4
Any horizontal line has a slope of 0
Answer: The slope of y= -4 is 0