Question: If, for some constant m, for all x 1 x 2 , show that f(x) = mx + b, where b is some constant.

If, for some constant m,f(x)-f(x) = m m X2X1

for all x1 ≠ x2, show that f(x) = mx + b, where b is some constant.

f(x)-f(x) = m m X2X1

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