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Which interval shows 6 - 4x ≥ -10 on the number line?

Answer and explanation

Correct answer: (−∞, 4]

The governing concept is solving a linear inequality and reversing its sign when dividing by a negative number. Start with 6 - 4x ≥ -10. Subtract 6 from both sides to obtain -4x ≥ -16. Dividing by -4 reverses the inequality from ≥ to ≤, giving x ≤ 4. The equality sign means 4 is included, so the endpoint is represented by a closed bracket or a filled point. Every number smaller than 4 is included, which gives the interval (-∞, 4]. Therefore option B is correct. Option A excludes the allowed endpoint 4. Options C and D shade values to the right and reflect either a sign-reversal mistake or incorrect direction. The result can also be checked by substituting a value such as x=0.

Related tags

Linear-InequalitiesNumber-LineInterval-NotationNegative-CoefficientMathematicsRepresentation On Number LineLinear InequalitiesClass 11 Mcq

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