Write a proof for the statement "If 2x – 7 = 13, then x = 10." Which properties are used the proof?
Just like in a proof, we start out with what's given. For us, that would be 2x – 7 = 13. The next step would be adding 7 to both sides (gracias, addition property) and then dividing by 2 (merci, division property). Will that give us the right answer? You betcha. And here's the proof.