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After solving ( 5-4x\ge 17 ) and showing it on the number line, which form is correct?

Answer and explanation

Correct answer: ( x\le -3 ), closed at ( -3 ), shaded left

The direct answer is option A: x≤-3, with a closed point at -3 and shading to the left. Start with 5-4x≥17. Subtract 5 from both sides: -4x≥12. Divide by -4 and reverse the inequality sign: x≤-3. Because the original sign is ≥, equality is included, so -3 receives a closed point. Values less than -3 are solutions, so shade left. Option A matches every part. Option B incorrectly excludes -3 by using <. Option C shades right, which represents x≥-3 rather than the actual solution. Option D also shades right and uses a strict > sign, so both its direction and endpoint are wrong. A reliable check is x=-4: 5-4(-4)=21≥17, confirming that numbers to the left work. The common mistake is forgetting to reverse the sign when dividing by -4.

Related tags

Linear-InequalitiesNegative-CoefficientNumber-Line

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