Answer
An exponential decay.
Work Step by Step
For $x$.
$1+1=2$
$2+1=3$
$3+1=4$
For $y$.
$162\cdot \frac{2}{3}=108$
$108\cdot \frac{2}{3}=72$
$72\cdot \frac{2}{3}=48$
As $x$ increases by $1$ and $y$ Multiplied by $\frac{2}{3}$.
So, the function is an exponential decay.
