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Find the solution of (2x+1\le 5x-8).

Answer and explanation

Correct answer: (x\ge 3)

The direct answer is option A, x\ge3. Begin with 2x+1\le5x-8. Subtract 2x from both sides: 1\le3x-8. Add 8 to both sides: 9\le3x. Divide by positive 3: 3\le x, which is the same as x\ge3. Option A is correct. Option B, x\le3, reverses the direction without a valid reason; no negative number was used. Option C, x\ge-3, has the wrong boundary because the correct division gives 3, not -3. Option D, x\le-3, has both the wrong sign direction and wrong boundary. Check x=3: left side is 7 and right side is 7, so equality is allowed. Check x=4: 9\le12 is true, while x=2 gives 5\le2, false. Memory cue: only multiplication or division by a negative number reverses an inequality.

Related tags

Linear-InequalitiesVariables-Both-SidesClass-11Easy

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