Given the equation y = x – 2, you substitute 3 for y. Check all true statements below.

Substituting 3 for y means temporarily replacing y with 3, so the equation becomes 3 = x − 2. Adding 2 to both sides gives x = 5. With y = 3 and x = 5, the original equation y = x − 2 is still true; substitution is not limited to x.

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