Ch. R - Algebra Review

Lial12th EditionTrigonometryISBN: 9780136552161Not the one you use?Change textbook

Lial 12th Edition

Ch. R - Algebra Review

Problem R.2.67

Chapter 1, Problem R.2.67

Find the given distances between points P, Q, R, and S on a number line, with coordinates -4, -1, 8, and 12, respectively. See Example 3. d (Q, R)

Verified step by step guidance

Identify the coordinates of points Q and R on the number line. Here, Q is at -1 and R is at 8.

Recall that the distance between two points on a number line is the absolute value of the difference of their coordinates. The formula is: \(d(A, B) = |x_B - x_A|\).

Apply the distance formula to points Q and R: \(d(Q, R) = |8 - (-1)|\).

Simplify the expression inside the absolute value: \(8 - (-1) = 8 + 1\).

Calculate the absolute value to find the distance: \(d(Q, R) = |9|\).

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Key Concepts

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

Distance on a Number Line

The distance between two points on a number line is the absolute value of the difference between their coordinates. This ensures the distance is always a non-negative number, representing the length between points regardless of direction.

Absolute Value

Absolute value measures the magnitude of a real number without regard to its sign. For any number x, |x| is the distance from zero on the number line, which is always non-negative, making it essential for calculating distances.

Coordinate Points on a Number Line

Points on a number line are represented by their coordinates, which are real numbers indicating their position relative to zero. Understanding these coordinates allows for straightforward calculation of distances and relationships between points.

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