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determine, find, and graph...............

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a) Since f(x) = 5x+8 is increasing everywhere, f(x) is ono-to-one.
b) Switch x and y, and solve for y,
x = 5y+8
=> y = f^-1(x) = (x-8)/5
c) Graph both f(x) and f^-1(x), and pay attention that f^-1(x) can be obtained by reflecting f(x) over y = x.