Use interval notation to represent all values of x satisfying the given conditions. y = 8 - |5x + 3| and y is at least 6

검증된 단계별 안내

Step 1: Start by understanding the inequality. The problem states that y = 8 - |5x + 3| and y is at least 6. This means we need to solve the inequality 8 - |5x + 3| ≥ 6.

Step 2: Isolate the absolute value expression. Subtract 6 from both sides of the inequality: 8 - |5x + 3| - 6 ≥ 0, which simplifies to 2 - |5x + 3| ≥ 0.

Step 3: Rearrange the inequality to isolate the absolute value term. Subtract 2 from both sides: -|5x + 3| ≥ -2. Then multiply through by -1 (remember to reverse the inequality sign when multiplying by a negative): |5x + 3| ≤ 2.

Step 4: Solve the absolute value inequality. Recall that |A| ≤ B implies -B ≤ A ≤ B. Apply this to the expression |5x + 3| ≤ 2: -2 ≤ 5x + 3 ≤ 2.

Step 5: Solve the compound inequality for x. First, subtract 3 from all parts: -2 - 3 ≤ 5x ≤ 2 - 3, which simplifies to -5 ≤ 5x ≤ -1. Then divide through by 5: -1 ≤ x ≤ -1/5. Represent this solution in interval notation as [-1, -1/5].

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주요 개념

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

Absolute Value Function

The absolute value function, denoted as |x|, represents the distance of x from zero on the number line, always yielding a non-negative result. In the context of the given equation, |5x + 3| indicates that the expression inside the absolute value can take on both positive and negative values, affecting the overall equation's solutions.

Inequalities

Inequalities express a relationship where one side is not necessarily equal to the other, using symbols like '≥' or '<'. In this problem, the condition 'y is at least 6' translates to the inequality y ≥ 6, which will guide the determination of the values of x that satisfy the equation when combined with the absolute value expression.

Interval Notation

Interval notation is a mathematical notation used to represent a range of values on the number line. It uses brackets [ ] for inclusive endpoints and parentheses ( ) for exclusive endpoints. Understanding how to convert the solutions from inequalities into interval notation is crucial for clearly expressing the set of x values that meet the specified conditions.