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How will (4x − 9)/5 > 7 be shown on the number line?

Answer and explanation

Correct answer: x > 11; open point at 11 and shading to the right

Multiply both sides of (4x − 9)/5 > 7 by 5. Because 5 is positive, the direction of the inequality remains the same: 4x − 9 > 35. Add 9 to both sides to obtain 4x > 44, and divide by the positive number 4 to get x > 11. The strict inequality excludes x = 11, so the number line must show an open circle at 11. Since all values greater than 11 are located to the right, the ray extending rightward is shaded. A closed circle would incorrectly include 11 and would correspond to ≥. Shading to the left would represent a value less than 11. Therefore the complete and correct representation is given by option A.

Related tags

Linear InequalitiesNumber LineOpen EndpointRepresentation On Number LineMathematicsClass 11 Mcq

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