Final answer:
The y-intercept of the equation y = 3x is 0.
Step-by-step explanation:
The y-intercept of the equation y = 3x can be found by setting x = 0 and solving for y. When x is 0, the equation becomes y = 3(0). Simplifying further, we get y = 0. Therefore, the y-intercept is 0.
Learn more about y-intercept in linear equations