Answer:
Firstly
f(x)=3x-2=y then
Interchanging x and y we get
x=3y-2
x+2=3y
y=(x+2)/3
f-1(x)=(x+2)/3
f-1(13)=(13+2)/3
f-1(13)=5
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The answer is d
when you plot all the points on a graph, it makes a straight diagonal line, making it a positive liner function. none of the inputs or outputs are repeated either.