To solve the problem, we need to find the value of \( x \) in the equation \( x + 3y = 10 \), given that \( y = 4 \).
1. Substituting the Value of \( y \):
We are given:
\( x + 3y = 10 \)
Substitute \( y = 4 \) into the equation:
\( x + 3(4) = 10 \)
2. Simplifying the Equation:
\( x + 12 = 10 \)
3. Solving for \( x \):
Subtract 12 from both sides:
\( x = 10 - 12 = -2 \)
Final Answer:
The value of \( x \) is -2.