SAT Question c99d154a: Nonlinear Functions answer and explanation with Desmos solution

A y-intercept of a graph in the xy-plane is a point $\left(x,y\right)$ on the graph where $x=0$. For the graph shown, at $x=0$, the corresponding value of $y$ is $3$. Therefore, the y-coordinate of the y-intercept of the graph shown is $3$.