The equation of the line given is $y = 3 - 5x$.

The $y$-intercept of a line is the value of $y$ when $x = 0$. To find it:

1. Substitute $x = 0$ into the equation: $y = 3 - 5(0)$

2. Simplify: $y = 3$

Thus, the $y$-intercept of the line is 3.

Would you like further clarification or additional examples? Here are five related questions for further exploration:

1. What is the slope of this line, and how is it interpreted geometrically?
2. How can the equation be rewritten in standard form $Ax + By = C$?
3. What is the x-intercept of this line, and how is it calculated?
4. How would the graph of this line change if the slope were doubled?
5. How do you determine the equation of a line if given its slope and a point?

Tip: Remember, the $y$-intercept is always the constant term in the slope-intercept form $y = mx + b$ when $x = 0$.