Answer
The slope of the line is 0 and the y-intercept is (0,4).
Work Step by Step
The line $y=4=0x+4$ is written in the form $y=mx+b$, where m is the slope of the line and the point (0,b) is the y-intercept.
$m=0$ and $b=4$
Therefore, the slope of the line is 0 and the y-intercept is (0,4).