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What is the solution of (\frac{7-2x}{5}\le\frac{3x+1}{10})?

Answer and explanation

Correct answer: x\ge\frac{13}{7}

The governing concept is preservation of an inequality under multiplication by a positive number. The denominators 5 and 10 have positive common denominator 10, so multiplying both sides by 10 does not reverse the sign. We obtain 2(7-2x)\le3x+1, or 14-4x\le3x+1. Subtracting 1 gives 13-4x\le3x; adding 4x gives 13\le7x. Finally, division by positive 7 yields x\ge13/7. Therefore option A is correct, and the endpoint 13/7 is included because the original relation is ‘less than or equal to’. Option B reverses the direction, option C incorrectly interchanges the numerator and denominator of the boundary value, and option D has an incorrect sign.

Related tags

Linear InequalitiesClass 11Fractional InequalityOne VariableAlgebraic Solution Of Linear Inequalities In One VariableMathematicsClass 11 Mcq

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