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Find the solution of (18-5x>3).

Answer and explanation

Correct answer: (x<3)

The direct answer is option A: x<3. Begin with 18-5x>3. Subtract 18 from both sides: -5x>-15. Divide by -5. Because division by a negative number reverses the sign, x<3. A is correct. Test x=2: 18-10=8>3, so it works. The boundary x=3 is excluded because 18-15=3>3 is false. B, x>3, has the wrong direction; x=4 gives -2>3, false. C, x≤3, incorrectly includes x=3 even though strict inequality fails there. D, x≥3, has the wrong direction and includes invalid values. The most common error is dividing by -5 while leaving > unchanged. A number-line answer has an open circle at 3 and shading to the left. Memory cue: a strict > remains strict, and a negative division flips it to <.

Related tags

Negative DivisionStrict InequalityCommon Mistake

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