Math Problem Statement

the point (-3, 8) lies on the graph of y = f(x). Using mapping notation, state the coordinates of of this point after the following transformation: y + 1 = f(1/4x - 1)

Solution

The given transformation is y+1=f(14x1)y + 1 = f\left( \frac{1}{4}x - 1 \right).

Step-by-Step Breakdown:

  1. Horizontal Transformation:

    • 14x1\frac{1}{4}x - 1 represents two transformations:
      • Horizontal stretch by a factor of 4. To account for this, multiply the xx-coordinate by 4.
      • Horizontal shift to the right by 1. To account for this, add 1 to the xx-coordinate.

    Applying this to the point (3,8)(-3, 8): x=4×(3+1)=4×(2)=8x' = 4 \times (-3 + 1) = 4 \times (-2) = -8

  2. Vertical Transformation:

    • y+1=f(...)y + 1 = f(\text{...}) indicates a vertical shift down by 1. So, subtract 1 from the yy-coordinate.

    Applying this to the point (3,8)(-3, 8): y=81=7y' = 8 - 1 = 7

Final Coordinates:

After the transformation, the new coordinates of the point are (8,7)(-8, 7).

Would you like more details on the transformations, or do you have any questions?

Here are 5 related questions to explore:

  1. What happens to the point if the transformation includes a reflection across the y-axis?
  2. How would the transformation affect the slope of a line passing through the original point?
  3. What is the effect of applying only the horizontal transformation to the point?
  4. How do you reverse a vertical shift in a transformation equation?
  5. What happens if we change the stretch factor from 4 to another number?

Tip: Always handle horizontal transformations (stretch/compression and shifts) before applying vertical changes!

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Math Problem Analysis

Mathematical Concepts

Transformations
Functions
Coordinate Geometry

Formulas

Horizontal transformation: f(ax + b) → multiply x-coordinate by 1/a and shift by -b/a
Vertical transformation: f(x) + k → shift y-coordinate by -k

Theorems

Function transformation rules
Coordinate geometry transformations

Suitable Grade Level

Grades 9-11