The general expression for any straight line is:
![y=mx+b](https://img.qammunity.org/2023/formulas/mathematics/high-school/smsb8cbft03lwblmi49nf2l6jby2ofxzws.png)
Where:
• m is the slope of the line
,
• b is the y-axis intercept
In this case, we have a straight line with equation
![y=-4\text{ }\rightarrow y=0x-4](https://img.qammunity.org/2023/formulas/mathematics/college/uh4e6beysyd4wvsj7sksdrho4t7qo2xs7j.png)
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