1. The problem is to find the value of $y$ when $x=0$ in the equation $15x + 5 = y$. 2. The formula given is $y = 15x + 5$. 3. To find $y$ when $x=0$, substitute $0$ for $x$ in the equation: $$y = 15(0) + 5$$ 4. Simplify the expression: $$y = 0 + 5 = 5$$ 5. Therefore, when $x=0$, $y=5$.