Instructions for problems $3$ and $4$

For simplicity, from here on$,$ we will remove the time$-$dependent behavior from our consideration by setting $t=0.$ Thus the following plots are only of $y$ vs$.x.$

Below are several graphs. Questions $3$ and $4$ will reference these graphs.

Plot A

$1\mathrm{.}5$

The graph

$y1$ is

The graph th

$y2$ is