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Mark for Review

If 3(x - 8) - 16 = 8(x + 10) + x, what is the value of 6x?

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Correct Answer:

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Explanation

-120

The question asks for the value of an expression based on an equation. When a Digital SAT question asks for the value of an expression, there is usually a straightforward way to solve for the expression without needing to completely isolate the variable. Start solving by distributing the numbers outside the parentheses on both sides of the equation. The equation becomes 3x - 24 - 16 = 8x + 80 + x. Simplify both sides of the equation to get 3x - 40 = 9x + 80. Subtract 3x from both sides of the equation to get -40 = 6x + 80, then subtract 80 from both sides of the equation to get -120 = 6x. The question asked for the value of 6x, so stop here. The correct answer is -120.