Answer
$\{2\}$
Work Step by Step
Here, we are finding the $x$ value where $Y_1$ and $Y_2$ share the same value. To do so, set the two equal to each other and solve for $x$, and then check the table of values to confirm.
$3(x-4)=3(2-2x)$
$3x-12=6-6x$
$9x=18$
$x=2$