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Algebra / Linear equations in one variable Difficulty: Easy

If 3 x = 30 , what is the value of 3 x - 12 ?

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Explanation

Choice B is correct. Subtracting 12 from each side of the given equation yields 3x-12=30-12, or 3x-12=18. Therefore, the value of 3x-12 is 18 .

Choice A is incorrect. This is the value of x-12, not 3x-12.

Choice C is incorrect. This is the value of x+12, not 3x-12.

Choice D is incorrect. This is the value of 3x+12, not 3x-12.