To solve for \( y \) in the equation \( y + b = c \), we need to isolate \( y \) on one side of the equation. This can be done by subtracting \( b \) from both sides of the equation.
Step 1: Isolate \( y \) in the Equation
To solve for \( y \) in the equation \( y + b = c \), we need to isolate \( y \). This can be done by subtracting \( b \) from both sides of the equation:
\[
y = c - b
\]
Step 2: Substitute Given Values
Substitute the given values \( b = 3 \) and \( c = 7 \) into the equation:
\[
y = 7 - 3
\]
Step 3: Simplify the Expression
Perform the subtraction to find the value of \( y \):
\[
y = 4
\]
Final Answer
The solution to the equation is \( \boxed{y = 4} \).