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SAT

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A written answer, marked

A question from an SAT mock paper, answered and marked. From SAT Preparation: A Practical Guide for Test Day.

Paper — SAT Preparation18:42
82%SAT Preparation — marked27/33 marks · 18:42 taken

A line is defined by 3x − 7 = 11. What is the value of x?

3/4

I added 7 to get 3x = 18, then divided by 3, so x = 6. I checked that 3(6) − 7 = 11.

The equation and verification are correct. The response would be stronger if it stated that the question asks for x and showed the inverse operations in order; the method is still valid.

Missed

Did not label the requested quantity before solving.

Model answerGiven 3x − 7 = 11 and asked to find x, add 7 to both sides to obtain 3x = 18. Divide both sides by 3, giving x = 6. Verify: 3(6) − 7 = 11, so the value is consistent with the original equation.

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