Math Problem Statement
The x y-coordinate plane is given. A function enters the window in the second quadrant, goes down and right linearly, passes through the point (−4, 1), sharply changes direction at the point (−3, 0), goes up and right linearly, passes through the point (−2, 1), crosses the y-axis at y = 3, and exits the window in the first quadrant.
Identify the parent function and the transformation represented by the graph. Write an equation for the function represented by the graph.
Step 1
Note that y is always nonnegative and that the two parts of the graph are linear. Identify the parent function of the given graph.
y = $$
Correct: Your answer is correct.
webMathematica generated answer key That's right!
Step 2
The given graph shows the rigid transformation of the function
y = |x|.
Identify the transformation represented by the graph. (Select all that apply.)
vertical shift of 3 units upward
reflection in the x-axis
horizontal shift of 3 units to the right
vertical stretch
horizontal shift of 3 units to the left
vertical shift of 3 units downward
Solution
Step 1: Identify the Parent Function
The function described involves both linear and non-negative values of , with sharp turns and a V-like shape. Based on this information, the parent function is most likely:
This is because the absolute value function, , has a V-shape and is always non-negative, fitting the description of the graph entering the second quadrant, changing direction, and having linear segments on either side of the vertex.
Step 2: Identify the Transformation Represented by the Graph
Now let's identify the transformations based on the description of the graph. Here's a step-by-step breakdown of the changes:
-
Vertical shift of 3 units upward: The graph crosses the -axis at , whereas the parent function crosses the -axis at . This indicates a vertical shift of 3 units upward.
-
Reflection in the x-axis: There's no mention of the graph being reflected over the x-axis (it stays above the x-axis), so this does not apply.
-
Horizontal shift of 3 units to the right: The function changes direction at , which corresponds to a shift of 3 units to the right from the parent function's vertex at . This suggests a horizontal shift of 3 units to the right.
-
Vertical stretch: There's no indication of a stretching in the vertical direction (the function seems to maintain its "V" shape), so this does not apply.
-
Horizontal shift of 3 units to the left: The vertex of the transformed function appears at , not at , indicating a horizontal shift to the left of 3 units (not right, as we first suspected).
-
Vertical shift of 3 units downward: The graph is shifted upward by 3 units, not downward. Therefore, this does not apply.
Summary of Transformations:
- Vertical shift of 3 units upward
- Horizontal shift of 3 units to the left
Final Equation
Given the transformations, the equation of the transformed function is:
This reflects:
- The horizontal shift of 3 units to the left (hence the inside the absolute value),
- The vertical shift of 3 units upward (the outside the absolute value).
Would you like to explore more details about transformations or the graphing process? Here are 5 related questions for further learning:
- How does the graph of a function change when a horizontal shift and vertical shift occur together?
- What would happen to the graph if the function were reflected over the x-axis?
- How do you identify the effects of transformations on other functions like or ?
- Can you explain how transformations affect the domain and range of the absolute value function?
- How do you graph step by step?
Tip: When dealing with absolute value transformations, always pay attention to the shifts inside and outside the absolute value, as they affect horizontal and vertical positioning, respectively!
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Math Problem Analysis
Mathematical Concepts
Transformations of Functions
Absolute Value Functions
Linear Functions
Formulas
y = |x|
Theorems
Rigid Transformations
Vertical and Horizontal Shifts
Suitable Grade Level
Grades 8-10
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