The problem given is:

$y = 3x - 2$ You are asked to find the value of $y$ when $x = 4$.

Substitute $x = 4$ into the equation:

$y = 3(4) - 2 = 12 - 2 = 10$

So, the value of $y$ when $x = 4$ is $\boxed{10}$.

Would you like any more details, or have any questions about this?

Here are 5 related questions for further practice:

1. What is the value of $y$ when $x = 0$?
2. How would the equation change if the slope (3) were doubled?
3. What is the x-intercept of the equation $y = 3x - 2$?
4. How does the equation represent a straight line?
5. What would happen to the graph if $-2$ was changed to $+2$?

Tip: To find the y-intercept in any linear equation of the form $y = mx + b$, just check the constant term $b$.