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What is the correct solution of (9-x<4)?

Answer and explanation

Correct answer: (x>5)

Start with the inequality \\(9-x<4\\). Subtract 9 from both sides to obtain \\(-x<-5\\). To isolate x, multiply or divide both sides by \\(-1\\). Multiplication by a negative number reverses the inequality sign, so the result becomes \\(x>5\\). Therefore every real number greater than 5 satisfies the original inequality, and option A is correct. The sign reversal is essential; leaving the sign as < would give an incorrect solution.

A quick check confirms the result. If \\(x=6\\), then \\(9-6=3<4\\), so it works. If \\(x=5\\), then \\(9-5=4\\), which is not strictly less than 4, so 5 is excluded. Values below 5 fail the condition, while all values above 5 work. Thus the solution set is \\( (5,\infty)\\), equivalently \\(x>5\\), exactly as stated in the supplied answer A.

Related tags

Linear InequalitiesNegative CoefficientSolve

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