10

Set 5: Linear Inequalities

Explanation

Answer: A

Which value is a solution to 4(2x)3(x4)+64(2 - x) \leq 3(x - 4) + 6?

A.

x=2x = 2

✓ Correct
B.

x=1x = 1

C.

x=0x = 0

D.

x=1x = -1

Detailed Explanation

Choice A is correct. Choice A is the correct answer. Solve the inequality first. 1. Distribute: 84x3x12+68- 4 x \leq 3 x - 12 + 6 2. Simplify: 84x3x68- 4 x \leq 3 x - 6 3. Add 4 x: 87x68\leq 7 x - 6 4. Add 6: 147x14\leq 7 x 5. Divide by 7: 2x2\leq x, or x2x \geq 2 6. Test Choices: We need a value 2\geq 2. Only x=2x=2 works (boundary value). Strategic Tip: x2x \geq 2 means 2 is included. Choice B is incorrect because 1 is not 2\geq 2. Choice C is incorrect because 0 is not 2\geq 2. Choice D is incorrect because -1 is not 2\geq 2.

Key Steps:

The correct answer is x=2x = 2

Why others are wrong:
B: Choice B is incorrect and may result from a calculation error.
C: Choice C is incorrect and may result from a calculation error.
D: Choice D is incorrect and may result from a calculation error.

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