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If (4x+7\le 2x+15) or (5-3x<2), what is the solution set?

Answer and explanation

Correct answer: all real x

For an ‘or’ statement, the solution is the union of the solution sets of the two inequalities, not their intersection. First, 4x+7\le2x+15 gives 2x\le8 and hence x\le4. Second, 5-3x<2 gives -3x<-3; dividing by the negative number -3 reverses the sign, so x>1. Thus the combined set is (-\infty,4]\cup(1,\infty). Every real number belongs to this union: numbers at most 4 satisfy the first inequality, while numbers greater than 1 satisfy the second. For example, a number above 4 satisfies the second, and a number at most 1 satisfies the first. Therefore option C, all real x, is correct. Option D is only the intersection and is inappropriate for ‘or’.

Related tags

Linear InequalitiesClass 11Union Of SolutionsOne VariableAlgebraic Solution Of Linear Inequalities In One VariableMathematicsClass 11 Mcq

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