To find $g(3)$, we need to look at the graph of $g(x)$ on the left side of the image and determine the value of $g(x)$ when $x = 3$.

Looking at the graph:

1. Locate $x = 3$ on the horizontal axis.
2. Follow this position vertically to find the corresponding point on the line of $g(x)$.
3. Observe the $y$-coordinate of this point.

From the graph, when $x = 3$, the $y$-coordinate of $g(x)$ appears to be $3$.

So, the answer is: $g(3) = 3$

Would you like further details or explanations?

Here are five related questions for further practice:

1. What is the slope of the function $g(x)$ as shown on the graph?
2. How would you find $g(-3)$ using the same graph?
3. What is the y-intercept of $g(x)$ on this graph?
4. How can you determine if $g(x)$ is a linear function just by looking at the graph?
5. Given the function $h(x) = 3x^2 - 2x + 2$, what is $h(3)$?

Tip: When finding the value of a function from a graph, always start by locating the x-value on the horizontal axis and then trace it to the function's curve or line to find the corresponding y-value.