Math Problem Statement

Starting with the graph of

𝑓

(

π‘₯

)

=

3

π‘₯

, write the equation of the graph that results when:

(a)

𝑓

(

π‘₯

)

is shifted 5 units upward.

𝑦

=  

(b)

𝑓

(

π‘₯

)

is shifted 8 units to the left.

𝑦

=  

(c)

𝑓

(

π‘₯

)

is reflected about the x-axis and the y-axis.

𝑦

=

Solution

Let's analyze the given transformations step by step. The original function is:

f(x)=3xf(x) = 3x

(a) Shift 5 units upward:

To shift a function upward by cc units, you add cc to the function. In this case, the shift is 5 units upward, so the new function is:

y=3x+5y = 3x + 5

(b) Shift 8 units to the left:

To shift a function to the left by cc units, you replace xx with x+cx + c in the function. Since the shift is 8 units to the left, you substitute xx with x+8x + 8, so the new function is:

y=3(x+8)y = 3(x + 8)

Expanding this:

y=3x+24y = 3x + 24

(c) Reflection about the x-axis and y-axis:

  • Reflection about the x-axis: Multiply the function by βˆ’1-1.
  • Reflection about the y-axis: Replace xx with βˆ’x-x.

Applying both transformations to the original function f(x)=3xf(x) = 3x:

  1. Reflecting about the x-axis gives βˆ’3x-3x.
  2. Reflecting about the y-axis gives βˆ’3(βˆ’x)=3x-3(-x) = 3x.

Combining both reflections, we get:

y=βˆ’3(βˆ’x)=3xy = -3(-x) = 3x

However, reflecting about both axes will result in the original function since it gets reversed twice.

Therefore, after reflecting about both axes, the equation remains:

y=βˆ’3xy = -3x


Summary of results:

  • (a) Shift 5 units upward: y=3x+5y = 3x + 5
  • (b) Shift 8 units to the left: y=3x+24y = 3x + 24
  • (c) Reflected about the x-axis and y-axis: y=βˆ’3xy = -3x

Would you like more details or clarification?


Here are 5 related questions to explore further:

  1. How would the equation change if the function were shifted 5 units downward instead of upward?
  2. What would happen if the function were shifted 8 units to the right instead of to the left?
  3. How do you reflect a function about the y-axis alone?
  4. How does the slope change under different transformations?
  5. What is the effect of combining shifts and reflections?

Tip: When applying transformations to a graph, always think of shifts as changes to the inputs (horizontal) or outputs (vertical) and reflections as flipping the graph across an axis.

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Math Problem Analysis

Mathematical Concepts

Linear Functions
Graph Transformations

Formulas

Vertical shift: y = f(x) + c
Horizontal shift: y = f(x + c)
Reflection over x-axis: y = -f(x)
Reflection over y-axis: y = f(-x)

Theorems

Transformation Theorems in Coordinate Geometry

Suitable Grade Level

Grades 8-10