Hi,

using  y = mx = b

the graph of f is parallel to the line 3x-8y=16 OR y = (3/8)x - 2 , m = 3/8

Line f(x) = (3/8)x + b

     f(4) = 3/2 + b = -1  or  b = -5/2

Line f(x) = (3/8)x - 5/2 

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