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1) Pick 2 points intercepted by the line in this case (0,1) and (5,-1)
2) Plug them into the formula:
3) There you have the slope.
y= -2/5x +b
4) Plugging into
(0,1)
1=-2/5(0)+b
b=1
So the function is f(x) = -2/5x +1