You're really close. lol.
the slope of the line isn't negative though.
when the line is moving up to the right, it's positive.
the y-intercept is also positive. the y-intercept is where the line intercepts with the y-axis. if you look at the graph, you'll see that the line intercepts with the y-axis at +8 instead of -8
The answer is:
C. y = 1/4x + 8
