Answer:
B. zero
Step-by-step explanation:
The slope of a line is defined as:
[tex]\frac{\Delta y}{\Delta x}[/tex]
where [tex]\Delta y[/tex] and [tex]\Delta x[/tex] means a change in [tex]y[/tex] and a change in [tex]x[/tex]
in this case we can see that for any [tex]x[/tex], [tex]y[/tex] is always equal to 4 so [tex]y[/tex] has a constant value, thus there is no change in [tex]y[/tex] ⇒ [tex]\Delta y=0[/tex].
In terms of the slope we have:
[tex]\frac{\Delta y}{\Delta x}=\frac{0}{\Delta x}=0[/tex]
The slope of the line is zero.
