The solution will be posted in a **sequential hint** based format. **You have to verify** the steps of hints.

**Sequential Hints:**

Step 1:

Solution set of sin(\(\frac{x+y}{2}\)) = 0 is {\({x + y = 2n\pi : n \in \mathbb{N}}\)}

– A set of parallel straight lines.

Step 2:

Solution set of |x| + |y| = 1 has the picture of a diamond as follows:

Step 3:

**Combine the two pictures, please! **

Step 4:

Find out the intersection line. Find out the solution now. Go to the next problem.