Using the additive property of equality, what is X if X + 5 = 12?

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Multiple Choice

Using the additive property of equality, what is X if X + 5 = 12?

Explanation:
To isolate X, use the additive property of equality: you can undo adding 5 by subtracting 5 from both sides. Subtracting 5 from the right side gives X = 12 − 5 = 7. Check: 7 + 5 = 12, so it satisfies the equation. If X were 5, 5 + 5 = 10, not 12; if X were 12, 12 + 5 = 17, not 12; if X were 17, 17 + 5 = 22, not 12. Only 7 works.

To isolate X, use the additive property of equality: you can undo adding 5 by subtracting 5 from both sides. Subtracting 5 from the right side gives X = 12 − 5 = 7. Check: 7 + 5 = 12, so it satisfies the equation. If X were 5, 5 + 5 = 10, not 12; if X were 12, 12 + 5 = 17, not 12; if X were 17, 17 + 5 = 22, not 12. Only 7 works.

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