Ch. 1 - Equations and Inequalities

Lial13th EditionCollege AlgebraISBN: 9780136881063Not the one you use?Change textbook

Lial 13th Edition

Ch. 1 - Equations and Inequalities

Problem 23

Chapter 2, Problem 23

Solve each inequality. Give the solution set in interval notation. (1/3)x+(2/5)x-(1/2)(x+3)≤1/10

Verified step by step guidance

First, write down the inequality clearly: \(\frac{1}{3}x + \frac{2}{5}x - \frac{1}{2}(x + 3) \leq \frac{1}{10}\).

Distribute the \(-\frac{1}{2}\) across the terms inside the parentheses: \(-\frac{1}{2} \times x\) and \(-\frac{1}{2} \times 3\) to get \(-\frac{1}{2}x - \frac{3}{2}\).

Combine like terms on the left side: add \(\frac{1}{3}x\), \(\frac{2}{5}x\), and \(-\frac{1}{2}x\) together by finding a common denominator and summing the coefficients.

After combining the \(x\) terms, rewrite the inequality as a linear inequality in the form \(Ax + B \leq C\), where \(A\), \(B\), and \(C\) are constants.

Isolate \(x\) by adding or subtracting constants on both sides and then dividing by the coefficient of \(x\). Remember to reverse the inequality sign if you multiply or divide by a negative number. Finally, express the solution set in interval notation.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Solving Linear Inequalities

Linear inequalities involve expressions with variables raised to the first power and inequality signs. To solve them, isolate the variable on one side by performing algebraic operations like addition, subtraction, multiplication, or division, while carefully reversing the inequality sign when multiplying or dividing by a negative number.

Combining Like Terms and Distributive Property

Combining like terms means adding or subtracting terms with the same variable and exponent. The distributive property allows you to multiply a single term across terms inside parentheses, e.g., a(b + c) = ab + ac. Both are essential for simplifying expressions before solving inequalities.

Interval Notation

Interval notation is a concise 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) includes a but excludes b, clearly showing the range of values satisfying the inequality.

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Interval Notation

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