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What is the correct way to show ( \frac{13-3x}{-4}>2 ) on the number line?

Answer and explanation

Correct answer: ( x>7 ), open at ( 7 ), shaded right

The direct answer is option C: \(x>7\), shown by an open point at 7 and shading to the right. Start with \((13-3x)/(-4)>2\). Multiply both sides by \(-4\); because it is negative, reverse the inequality: \(13-3x<-8\). Subtract 13: \(-3x<-21\). Divide by \(-3\), reversing the sign again: \(x>7\). The endpoint is open because 7 does not satisfy the original strict inequality: it gives \(2>2\), which is false. Option A wrongly includes 7 and points right. Option B has the wrong direction and excludes the wrong side. Option C has both the correct open endpoint and correct right-hand direction. Option D includes 7 and points left. The important warning is that dividing or multiplying by a negative number reverses the inequality sign.

Related tags

Linear-InequalitiesNegative-DenominatorNumber-Line

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