Verified answer

the line is literally y=4

If you add the 4 to both sides you get y=4. Thus your graph would have a horizontal line at 4 on the y-axis. The slope is 0 because it's y=0x+4.

well ...

you can rewrite it as:

y = 0 + 4

m = 1, b = 4

or

m =4, b = 0

;-)

y = 4 is a horizontal line passing thro` (0,4)

m = 0

b = 4