To solve the equation \(5y - 10 = -25\) for \(y\), follow these steps:
Step 1: Add 10 to both sides of the equation.
\[ 5y - 10 + 10 = -25 + 10 \]
This simplifies to:
\[ 5y = -15 \]
Step 2: Divide both sides by 5.
\[ \frac{5y}{5} = \frac{-15}{5} \]
This simplifies to:
\[ y = -3 \]
Solution: \(y = -3\)