$y=x$

Step 1 ：Given the equation: \(y = x\)

Step 2 ：For a given value of x, say \(x = 5\), we can find the value of y using the equation.

Step 3 ：Substitute the value of x into the equation: \(y = 5\)

Step 4 ：\(\boxed{y = 5}\) when \(x = 5\)