Graph Analysis: Determining Uniform vs Non-uniform Rate of Change in Piecewise Linear Function

Rate of Change with Piecewise Functions

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

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Is the rate of change uniform?
00:08 Let's take some points on the graph
00:29 Let's check the change between points
00:36 We can see the change is not equal, therefore it's not uniform
00:42 And this is the solution to the question

Step-by-step written solution

Follow each step carefully to understand the complete solution
1

Understand the problem

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

111222333444555666777888999101010111111121212111222333444555666000

2

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.

3

Final Answer

Non-uniform

Key Points to Remember

Essential concepts to master this topic
  • Definition: Uniform rate means all segments have identical slopes
  • Technique: Calculate ΔyΔx \frac{\Delta y}{\Delta x} for each segment: steep down = -2, gentle up = +1.5
  • Check: Compare all calculated slopes - if different values, rate is non-uniform ✓

Common Mistakes

Avoid these frequent errors
  • Assuming linear appearance means uniform rate
    Don't look at the overall graph shape and assume uniform rate = wrong conclusion! Even piecewise linear functions can have different slopes for each segment. Always calculate the slope of each individual segment separately.

Practice Quiz

Test your knowledge with interactive questions

Given the following graph, determine whether function is constant

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FAQ

Everything you need to know about this question

What's the difference between uniform and non-uniform rate of change?

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Uniform rate means the slope is exactly the same everywhere on the graph - like a straight line. Non-uniform rate means different parts of the graph have different slopes, even if each piece looks straight.

How do I calculate the slope of each segment?

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Pick two clear points on each segment and use slope=y2y1x2x1 \text{slope} = \frac{y_2 - y_1}{x_2 - x_1} . For example, if a segment goes from (1,1) to (3,5), the slope is 5131=42=2 \frac{5-1}{3-1} = \frac{4}{2} = 2 .

Can a piecewise function ever have uniform rate of change?

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Yes! If every single segment has the exact same slope, then the rate of change is uniform. But this is rare - most piecewise functions have segments with different slopes.

What if I can't read the exact coordinates from the graph?

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Use the grid lines to estimate coordinates as closely as possible. Even with small reading errors, you should be able to tell if slopes are clearly different between segments.

Why does this graph show non-uniform rate of change?

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Looking at the segments: the first goes steeply downward, the second goes gently upward, the third goes very steeply downward, and the fourth goes upward again. These clearly different directions and steepnesses mean different slopes!

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