AlgebraEasy–MediumTesting a value in an inequality
Algebra practice question
Which of the following values of x satisfies 4x − 7 ≥ 9?
- A. 4Correct
- B. 3
- C. 2
- D. 0
Answer: A. 4
Solve: 4x ≥ 16, so x ≥ 4. The value 4 itself works because the inequality includes equality: 4(4) − 7 = 9, and 9 ≥ 9 is true.
Why the other answers are wrong
- B. 3
- 4(3) − 7 = 5, and 5 ≥ 9 is false.
- C. 2
- 4(2) − 7 = 1, well below 9.
- D. 0
- 4(0) − 7 = −7, which is not at least 9.
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