The graphs of ff and f1f^{-1} are symmetrical about the line y=x.y=x.

Examples

x{x}
y{y}
(2,4){\left(2 , 4 \right)}
(5,2){\left(5 , -2 \right)}
(4,2){\left(4 , 2 \right)}
(2,5){\left(-2 , 5 \right)}
y=f(x){y=f(x)}
y=f1(x){y=f^{-1}(x)}
y=x{y=x}
f:x2x+8for xR,2<x<5.{f: x \mapsto - 2 x + 8} \allowbreak \quad \allowbreak {\textrm{for } x \in \mathbb{R}, 2 < x < 5.}
f1:x12x+4for xR,2<x<4.{f^{-1}: x \mapsto - \frac{1}{2} x + 4} \allowbreak \quad \allowbreak {\textrm{for } x \in \mathbb{R}, -2<x<4 .}
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