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Which interval form represents the solution of (5x-10<15)?

Answer and explanation

Correct answer: ((-\infty,5))

First isolate the term containing x. From \\(5x-10<15\\), add 10 to both sides, giving \\(5x<25\\). Next divide both sides by the positive number 5, so the inequality direction stays unchanged. The result is \\(x<5\\).

The solution contains every real number smaller than 5, but it does not contain 5 itself. In interval notation, an unbounded set extending left from 5 is written as \\((-\\infty,5)\\). The parenthesis at 5 is open because the inequality is strict. Therefore option A is correct. Option B would include 5 and would represent \\(x\\le5\\), while options C and D describe values greater than 5.

Related tags

Linear InequalitiesInterval NotationOpen Endpoint

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