1. **State the problem:** Solve the equation $4y = 12x$ for $y$. 2. **Formula and rules:** To isolate $y$, divide both sides of the equation by 4. 3. **Intermediate work:** $$4y = 12x$$ Divide both sides by 4: $$y = \frac{12x}{4}$$ Simplify the fraction: $$y = 3x$$ 4. **Explanation:** We started with the equation $4y = 12x$. To find $y$, we divided both sides by 4, which is the coefficient of $y$. This isolates $y$ on one side, giving us $y = 3x$. This means $y$ is three times $x$.