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Choose the solution of (\frac{7-3x}{2}< -1).

Answer and explanation

Correct answer: (x>3)

The answer is option A, x>3. Begin with (7−3x)/2<−1. Multiply both sides by 2. Because 2 is positive, the inequality sign stays the same: 7−3x<−2. Subtract 7 from both sides: −3x<−9. Now divide by −3. Division by a negative number reverses the sign, so x>3. Option A is correct. Option B, x<3, forgets to reverse the sign when dividing by −3. Option C, x>−3, has the wrong boundary because −9 divided by −3 is 3, not −3. Option D, x<−3, has both the wrong direction and the wrong boundary. Check x=4: (7−12)/2=−5/2, which is less than −1, so x=4 works. Check x=3: (7−9)/2=−1, but the inequality is strict, so equality is not accepted. Thus the solution is every number greater than 3, not 3 itself. The key exam rule is that division or multiplication by a negative number reverses an inequality sign.

Related tags

Linear-InequalitiesFractionNegative-Coefficient

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