Choice A is the correct answer. Set $x=0$ to find the y-intercept.

1. Method: The y-intercept occurs where $x = 0$.
2. Substitute: $3(0) + 4y = 12 \rightarrow 4y = 12$.
3. Solve: $y = 3$.

💡 Strategic Tip: You can also convert to slope-intercept form ($y = -\frac{3}{4}x + 3$), but setting $x=0$ is faster.

Choice B is incorrect because it's the coefficient of y. Choice C is incorrect because it's the wrong sign. Choice D is incorrect because it's the constant term before dividing.