1. The problem is to find the y-intercept of a function, which is the point where the graph crosses the y-axis. 2. The y-intercept occurs when $x=0$. 3. To find the y-intercept, substitute $x=0$ into the function $y=f(x)$ and solve for $y$. 4. For example, if the function is $y=2x+3$, substituting $x=0$ gives $y=2(0)+3=3$. 5. Therefore, the y-intercept is at the point $(0,3)$. 6. This method applies to any function: set $x=0$ and calculate $y$ to find the y-intercept.