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The given equation is:

\[
s = 4k + 4u
\]

We need to solve for \( k \).

### Step-by-step solution:
1. Subtract \( 4u \) from both sides of the equation:
   \[
   s - 4u = 4k
   \]
   
2. Divide both sides of the equation by 4 to isolate \( k \):
   \[
   k = \frac{s - 4u}{4}
   \]

Thus, the solution for \( k \) is:

\[
k = \frac{s - 4u}{4}
\]

Would you like further details or have any questions about this solution?

Here are 5 related questions for practice:
1. If \( s = 20 \) and \( u = 3 \), what is the value of \( k \)?
2. How would the equation change if the coefficient of \( k \) was 5 instead of 4?
3. Can this equation be written in terms of \( u \) instead of \( k \)?
4. What happens if both \( s \) and \( u \) are equal to 0? What is \( k \)?
5. How would the solution change if there were an additional constant term added to the equation?

**Tip:** When isolating variables, always remember to perform the same operation on both sides of the equation to maintain equality.

Learn how to solve the linear equation s = 4k + 4u by isolating k. This problem focuses on fundamental algebra concepts suitable for students in Grades 6-8. Follow the step-by-step solution to understand how to solve for variables.

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