Set 17: Linear Equations

Explanation

Answer: C

The sum of a number and 15 is equal to 42. What is the number?

What is the unknown number?

✓ Correct

Detailed Explanation

Choice C is correct. Let x be the number. x + 15 = 42. Subtract 15 from both sides: x = 27.

Key Steps:

•

The correct answer is 27

Why others are wrong:

A: Choice A is incorrect and may result from a calculation error.

B: Choice B is incorrect and may result from a calculation error.

D: Choice D is incorrect and may result from a calculation error.

Master all sections for your best SAT score