Answer:
it's slope is 0.
Step-by-step explanation:
Here, the function is,
y = 220
clearly, it represents a straight line parallel to x -axis with y-intercept = 220
since the straight line is parallel to x-axis, it's slope is 0.
In another way, let ([tex]x_{1} , y_{1}[/tex]) and ([tex]x_{2} , y_{2}[/tex]) be two points on the straight line y = 220 so, [tex]y_{1} = y_{2} =220[/tex] and suppose that [tex]x_{1} \neq x_{2}[/tex]
then, slope of the line y =220 is given by
m = [tex]\frac{y_{1} - y_{2}}{x_{1} - x_{2}}[/tex] =0
