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If (-\frac{2x-1}{5}+\frac{x+4}{10}\ge \frac{3}{2}), what is the solution for (x)?

Answer and explanation

Correct answer: (x\le -3)

Direct answer: option A, \(x\le-3\). Multiply by 10, which is positive: \(-2(2x-1)+(x+4)\ge15\). Expand: \(-4x+2+x+4\ge15\), so \(-3x+6\ge15\). Subtract 6: \(-3x\ge9\). Divide by negative 3 and reverse the sign: \(x\le-3\). Option A is correct. Option B reverses the final direction incorrectly. Option C has the wrong boundary sign and positive boundary. Option D also has the wrong direction and boundary. For checking, put \(x=-3\): the left side is \(3/2\), so equality holds. The key rule is to reverse an inequality when dividing by a negative number.

Related tags

Linear InequalitiesClass 11ExpertOne Variable

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