In all exercises, other than exercises with no solution, use interval notation to express solution sets and graph each solution set on a number line. In Exercises 27–50, solve each linear inequality. 5x + 11 < 26

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Start with the given inequality: \(5x + 11 < 26\).

Isolate the term with the variable by subtracting 11 from both sides: \(5x + 11 - 11 < 26 - 11\), which simplifies to \(5x < 15\).

Next, solve for \(x\) by dividing both sides of the inequality by 5: \(\frac{5x}{5} < \frac{15}{5}\), which simplifies to \(x < 3\).

Express the solution set in interval notation. Since \(x\) is less than 3, the solution is all real numbers less than 3, written as \((-\infty, 3)\).

To graph the solution on a number line, draw a number line, place an open circle at 3 (because 3 is not included), and shade all points to the left of 3.

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주요 개념

질문에 올바르게 답하기 위해 반드시 이해해야 하는 핵심 개념들은 다음과 같습니다.

Solving Linear Inequalities

A linear inequality involves an inequality symbol (<, >, ≤, ≥) with a linear expression. To solve it, isolate the variable by performing inverse operations, similar to solving linear equations, but remember to reverse the inequality sign when multiplying or dividing by a negative number.

Interval Notation

Interval notation is a way to represent solution sets of inequalities using parentheses and brackets. Parentheses indicate that an endpoint is not included, while brackets mean it is included. For example, (a, b) means all numbers between a and b, excluding a and b.

Graphing Solution Sets on a Number Line

Graphing solution sets involves shading the region on a number line that satisfies the inequality. Open circles represent excluded endpoints, and closed circles represent included endpoints. This visual helps understand the range of possible values for the variable.