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What is the solution of the inequality (6-5x\ge -9)?

Answer and explanation

Correct answer: (x\le 3)

The direct answer is option A: x≤3. Solve 6-5x≥-9 carefully. Subtract 6 from both sides: -5x≥-15. Now divide by -5. Division by a negative number reverses the inequality sign, so x≤3. A is correct and includes x=3; substitution gives 6-15=-9, and -9≥-9 is true. B, x≥3, forgets the reversal and gives the wrong direction. C, x<3, incorrectly excludes x=3 even though equality works. D, x>3, has both the wrong direction and the wrong endpoint. The reversal is essential: multiplying or dividing an inequality by a negative number changes which side is larger. A number-line view also helps: all values at or left of 3 work. Memory cue: subtracting 6 is harmless, but dividing by -5 flips ≥ into ≤.

Related tags

Linear InequalitiesNegative VariableNegative Constants

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