It is known that `x+y=10` and that `x=z`. Show that `z+y=10`.

Explanation

To solve the problem, we need to show that if \( x + y = 10 \) and \( x = z \), then \( z + y = 10 \).

**Step 1: Start with the given equations.**
We know:
1. \( x + y = 10 \) (Equation 1)
2. \( x = z \) (Equation 2)

**Step 2: Substitute \( z \) for \( x \) in Equation 1.**
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