Answer
Exponential function.
Work Step by Step
For $x$.
$1+1=2$
$2+1=3$
$3+1=4$
For $y$.
$6\times 2=12$
$12\times 2=24$
$24\times 2=48$
As $x$ increases by $1$ and $y$ multiplied by $2$.
So, the function is exponential.
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