The function f has the domain (-∞, +∞) and the same range.
To find the inverse (denote it as g) we have to solve the equation
f(g(x)) = x.
f(g(x)) = 8*g(x) + 10 = x,
g(x) = (x-10)/8.
The function g also has the domain and range (-∞, +∞).Actually, having inverse function is sufficient to be a one-to-one.
f(g(x)) = 8*[(x-10)/8] + 10 = (x-10) + 10 = x,g(f(x)) = [f(x)-10]/8 = [8x+10 - 10]/8 = 8x/8 = x.
For the graphs, see https://www.desmos.com/calculator/dw9iejncawThe graphs of f and g are symmetric with respect to y=x.
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