9

Set 3: Linear Inequalities (Advanced)

Explanation

Answer: A

Solve: 23x+5>12x+6\frac{2}{3}x + 5 > \frac{1}{2}x + 6

A.

x>6x > 6

✓ Correct
B.

x<6x < 6

C.

x>1x > 1

D.

x<1x < 1

Detailed Explanation

Choice A is correct. Choice A is the correct answer. Use the LCD to clear fractions. 1. LCD of 3 and 2 is 6: Multiply all terms by 6. 2. Multiply: 6(23x)+6(5)>6(12x)+6(6)6(\frac{2}{3}x) + 6(5) > 6(\frac{1}{2}x) + 6(6) 3. Simplify: 4x+30>3x+364x + 30 > 3 x + 36 4. Subtract 3 x: x+30>36x + 30 > 36 5. Subtract 30: x>6x > 6 Strategic Tip: Clearing fractions makes the algebra much simpler and less prone to arithmetic errors. Choice B is incorrect because it reverses the inequality direction. Choice C is incorrect because it might result from not multiplying the constants by 6. Choice D is incorrect because it combines wrong value and wrong direction.

Key Steps:

The correct answer is x>6x > 6

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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