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believe it would be f(x)=-1/2x-1/2

Explanation:

rise over run is y/x and looking at the graph as y decreases one x increases two giving us the slope(M) of -1/2 so using standard notation of y = mx+b we now have y=-1/2x+b now we need our b value we can find that by finding the y-int or where x=0 which again is -1/2 giving us the full equation of f(x)=-1/2x-1/2

pls try

i think descriptive but i'm not 100% sure.. sorry.