Constant Rate of Change Practice Problems & Solutions

Master constant rate of change with step-by-step practice problems. Learn to identify linear functions, calculate slopes, and analyze graphs with instant feedback.

📚What You'll Master in This Practice Session
  • Identify constant rate of change from tables of values
  • Calculate slope from two points on a linear function
  • Recognize straight-line graphs that represent constant rates
  • Determine if a function has constant or variable rate of change
  • Interpret step graphs with constant rate patterns
  • Apply constant rate concepts to real-world scenarios

Understanding Constant Rate of Change

Complete explanation with examples

Constant Rate of Change

The meaning of the constant rate of change of a function can be seen when the variables X X change in fixed proportions and the Y Y do as well. 

For example, if the constant interval of the X X is 2 2 and also that of the Y Y is stable and does not vary from time to time.
The interval of the Y Y variables does not necessarily have to be equal to that of the X X for it to be considered a case of constant rate of change.
If the function is represented with a straight graph, it means that the rate of change is constant.
The rate of change is the slope of the function.

A constant rate of change is represented by a straight line, as seen in the following scheme:

A2 - Constant rate of change of a function

Detailed explanation

Practice Constant Rate of Change

Test your knowledge with 9 quizzes

Given a table showing points on the graph of a function, determine whether or not the rate of change is uniform.

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Examples with solutions for Constant Rate of Change

Step-by-step solutions included
Exercise #1

Look at the graph below and determine whether the function's rate of change is constant or not:

–5–5–5–4–4–4–3–3–3–2–2–2–1–1–1111222333444555666777888999101010111111–3–3–3–2–2–2–1–1–1111222333444555000

Step-by-Step Solution

First we need to remember that if the function is not a straight line, its rate of change is not constant.

The rate of change is not uniform since the function is not a straight line.

Answer:

Not constant

Video Solution
Exercise #2

Given the following graph, determine whether the rate of change is uniform or not

111222333444555666111222333000

Step-by-Step Solution

To solve this problem, let's analyze the graph of the line:

  • Step 1: Identify two points on the line. For simplicity, let's choose the intercept at x=1 x = 1 and y=3 y = 3 , and another at x=6 x = 6 and y=0 y = 0 (assuming these are easily readable points).
  • Step 2: Calculate the slope using the formula y2−y1x2−x1\frac{y_2 - y_1}{x_2 - x_1}.
  • Step 3: Substituting in our chosen points, the slope is 0−36−1=−35\frac{0 - 3}{6 - 1} = \frac{-3}{5}.
  • Step 4: Since the graph is a straight line and the slope is constant, the rate of change is uniform.

Therefore, the graph shows a constant or uniform rate of change.

The solution to the problem is thus Uniform.

Since the correct answer is shown in the multiple-choice option "Uniform", we conclude it matches the analysis result.

Answer:

Uniform

Video Solution
Exercise #3

Given the following graph, determine whether the rate of change is uniform or not

111222333444555666777888999101010111111121212131313141414151515111222333444555666777888000

Step-by-Step Solution

Let's remember that if the function is not a straight line, its rate of change is not uniform.

Since the graph is not a straight line - the rate of change is not uniform.

Answer:

Non-uniform

Video Solution
Exercise #4

Given the following graph, determine whether the rate of change is uniform or not

111222333444555666777888999101010111111121212111222333444555666000

Step-by-Step Solution

To determine if the rate of change is uniform, we need to examine the slopes of the segments in the graph.

First, let's identify the segments in the graph. The graph provided has multiple segments as follows:

  • Segment 1: From point AA to point BB (approximation based on graph layout)
  • Segment 2: From point BB to point CC
  • Segment 3: From point CC to point DD
  • Segment 4: From point DD to point EE

Next, calculate the slope for each segment:

  • **Segment 1 (A to B):**
  • * Identify coordinates for points AA and BB. * Calculate slope: m1=change in ychange in xm_1 = \frac{\text{change in y}}{\text{change in x}}.
  • **Segment 2 (B to C):**
  • * Identify coordinates for points BB and CC. * Calculate slope: m2m_2.
  • **Segment 3 (C to D):**
  • * Identify coordinates of points CC and DD. * Calculate slope: m3m_3.
  • **Segment 4 (D to E):**
  • * Identify coordinates of points DD and EE. * Calculate slope: m4m_4.

Compare the slopes m1m_1, m2m_2, m3m_3, and m4m_4. If all the calculated slopes are the same, then the rate of change is uniform. If they differ, the rate of change is non-uniform.

Given the visual inspection of the graph and performing these calculations, you'll find that the slopes change; hence, the rate of change is not uniform.

Therefore, the solution to the problem is non-uniform.

Answer:

Non-uniform

Video Solution
Exercise #5

Given the following graph, determine whether the rate of change is uniform or not

–5–5–5–4–4–4–3–3–3–2–2–2–1–1–1111222333444555666777888999101010111111–3–3–3–2–2–2–1–1–1111222333444555000

Step-by-Step Solution

To determine whether the rate of change in the graph is uniform, we must analyze the graph for consistency in slope across its span:

  • Step 1: Observe the graph shape.
  • Step 2: Check where the line is straight, showing no change in slope, and where it curves or changes slope, indicating non-uniform change.

Now, let's work through these steps:

Step 1: By visually inspecting the graph, note that it does not form a perfectly straight line but rather curves upwards. This indicates variability in the slopes along the graph.

Step 2: Since the graph curves, indicating that the slope is not the same throughout, we conclude that the rate of change is not constant.

The curvature implies that the rate of change is non-uniform, as it varies at different points along the x-axis. Therefore, the slope is inconsistent, confirming non-uniformity.

Therefore, the graph shows a non-uniform rate of change.

Answer:

Non-uniform

Video Solution

Frequently Asked Questions

What is constant rate of change in simple terms?

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Constant rate of change means that as the x-variable increases by the same amount, the y-variable also changes by the same amount every time. This creates a straight line when graphed and represents the slope of a linear function.

How do you identify constant rate of change from a table?

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To identify constant rate of change from a table: 1) Calculate the change in y-values, 2) Calculate the change in x-values, 3) Divide change in y by change in x for each interval, 4) If all ratios are equal, the rate is constant.

What does a constant rate of change graph look like?

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A constant rate of change always appears as a straight line on a graph. The line can slope upward (positive rate), downward (negative rate), or remain horizontal (zero rate), but it must be perfectly straight.

Is slope the same as constant rate of change?

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Yes, slope and constant rate of change are the same concept. The slope of a linear function represents how much y changes for each unit change in x, which is exactly what constant rate of change measures.

Can a curved graph have constant rate of change?

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No, curved graphs cannot have constant rate of change. Only straight lines have constant rates because the slope must remain the same throughout the entire function for the rate to be constant.

What are real-world examples of constant rate of change?

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Common examples include: driving at steady speed (distance vs time), hourly wages (pay vs hours worked), constant temperature change, and unit pricing (total cost vs quantity purchased).

How is constant rate different from variable rate of change?

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Constant rate of change remains the same throughout the function and creates straight lines. Variable rate of change varies at different points, creating curved graphs like parabolas or exponential functions.

What formula calculates constant rate of change?

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The formula is: Rate of Change = (y₂ - y₁)/(x₂ - x₁). This gives you the slope between any two points. For constant rate, this value stays the same regardless of which points you choose.

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