Write an equation for the graph of a linear function that has slope - } and a y intercept -- 3.

The equation of a line is:
[tex]y=mx+b[/tex]Where m is the slope and b is the y-intercept.
Then, in this case:
m = -1/3
b = -3
Thus:
[tex]y=-\frac{1}{3}x-3[/tex]Is the answer.