g^{-1} (-2) =7

since 7 is the first coordinate corresponding to -2

h(x) =3x-13

y=3x-13

3x =y+13

x =(y+13)/3

h^{-1 }(x) =(x+13)/3

h^{-1}(2) =(2+13)/3 =15/3 =5

h(5) =3*5-13=15-13=2

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