Math Problem Statement

What kind of transformation converts the graph of f(x)= – 5x–5 into the graph of g(x)= – x–1?

Solution

To determine what transformation converts the graph of f(x)=5x5f(x) = -5x - 5 into the graph of g(x)=x1g(x) = -x - 1, we need to compare the two equations and look for changes in the structure.

Step 1: Compare the forms of the two functions

  1. The function f(x)=5x5f(x) = -5x - 5 is in slope-intercept form:
    f(x)=mx+bf(x) = mx + b, where:

    • m=5m = -5 (slope),
    • b=5b = -5 (y-intercept).
  2. The function g(x)=x1g(x) = -x - 1 is also in slope-intercept form:
    g(x)=mx+bg(x) = mx + b, where:

    • m=1m = -1 (slope),
    • b=1b = -1 (y-intercept).

Step 2: Identify the transformations

  • Change in slope: The slope of f(x)f(x) is 5-5, and the slope of g(x)g(x) is 1-1. The slope has changed from 5-5 to 1-1, which means the graph has undergone a vertical stretch (by a factor of 5) followed by a vertical compression (by a factor of 5), or it could be interpreted as a simple change in steepness.

  • Change in y-intercept: The y-intercept of f(x)f(x) is 5-5, and the y-intercept of g(x)g(x) is 1-1. This suggests a vertical translation of the graph upward by 44 units (because 1(5)=4-1 - (-5) = 4).

Step 3: Conclusion

The transformation from f(x)=5x5f(x) = -5x - 5 to g(x)=x1g(x) = -x - 1 can be described as:

  1. A vertical compression by a factor of 5 (changing the slope from 5-5 to 1-1).
  2. A vertical translation upward by 4 units (changing the y-intercept from 5-5 to 1-1).

Would you like more details on how these transformations work? Or have any further questions?


Here are 5 related questions to explore:

  1. How does a vertical stretch/compression affect the slope of a line?
  2. What is the general effect of a vertical translation on the graph of a function?
  3. How do you identify transformations when given two functions?
  4. Can you describe the effect of a horizontal shift on the graph of a linear function?
  5. How do reflections in the x-axis or y-axis alter the equation of a line?

Tip: When comparing linear functions, always start by comparing the slope and y-intercept to identify the main transformations.

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Math Problem Analysis

Mathematical Concepts

Linear Functions
Slope-Intercept Form
Graph Transformations

Formulas

Slope-Intercept Form: y = mx + b

Theorems

Transformation of Graphs
Vertical Stretch/Compression
Vertical Translation

Suitable Grade Level

Grades 8-10