Question: Stating that a function is 'linear' is different than stating that its graph is a line. (a) The function f1: R R given by f1(x)

Stating that a function is 'linear' is different than stating that its graph is a line.
(a) The function f1: R †’ R given by f1(x) = 2x - 1 has a graph that is a line. Show that it is not a linear function.
(b) The function f2: R2 †’ R given by

+x+ 2y

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