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

Examples

x{x}
y{y}
(4,5){\left(-4 , -5 \right)}
(0,7){\left(0 , 7 \right)}
(5,4){\left(-5 , -4 \right)}
(7,0){\left(7 , 0 \right)}
y=f(x){y=f(x)}
y=f1(x){y=f^{-1}(x)}
y=x{y=x}
f:x3x+7for xR,4x0.{f: x \mapsto 3 x + 7} \allowbreak \quad \allowbreak {\textrm{for } x \in \mathbb{R}, -4 \leq x \leq 0.}
f1:x13x73for xR,5x7.{f^{-1}: x \mapsto \frac{1}{3} x - \frac{7}{3}} \allowbreak \quad \allowbreak {\textrm{for } x \in \mathbb{R}, -5\leq x\leq 7 .}
Next: Composite functions >>