Math Problem Statement

Find the composition of transformations that map ABCD to EHGF. Reflect over the y-axis, then translate (x-2, y+?).

Solution

The problem involves a transformation of quadrilateral ABCDABCD into EHGFEHGF. Let's break it down step by step:

1. Reflect over the yy-axis

When you reflect a point (x,y)(x, y) over the yy-axis, the new coordinates become (x,y)(-x, y). Applying this to the vertices of ABCDABCD:

  • A(4,2)A(+4,2)A(-4, 2) \to A'(+4, 2)
  • B(3,4)B(+3,4)B(-3, 4) \to B'(+3, 4)
  • C(1,4)C(+1,4)C(-1, 4) \to C'(+1, 4)
  • D(2,2)D(+2,2)D(-2, 2) \to D'(+2, 2)

Thus, the reflection of ABCDABCD produces ABCDA'B'C'D', which is now situated to the right of the yy-axis.


2. Translate the figure

The problem specifies a translation (x2,y+?)(x - 2, y + ?). To determine the value of "?"), let's compare the final positions of the reflected vertices with those of \(EHGF:

For example, consider the reflected vertex A(4,2)A'(4, 2), which corresponds to E(2,1)E(2, -1) after translation. Solving for the vertical translation y+?=1y + ? = -1:

2+?=1    ?=32 + ? = -1 \implies ? = -3

The translation is therefore: (x2,y3)(x - 2, y - 3)


Final Answer:

The composition of transformations that maps ABCDABCD to EHGFEHGF is:

  1. Reflect over the yy-axis.
  2. Translate by (x2,y3)(x - 2, y - 3).

Would you like a detailed explanation of reflections and translations, or more examples?


5 Related Questions:

  1. What is the general formula for reflecting a point over the xx-axis and the origin?
  2. How does translation affect the slope of a line segment in a figure?
  3. Can you find the transformation mapping EHGFEHGF back to ABCDABCD?
  4. What are other common types of transformations besides reflections and translations?
  5. How do you determine the order of transformations if multiple compositions are applied?

Tip:

When performing a composition of transformations, always handle each step sequentially, as the order of transformations matters in most cases!

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Math Problem Analysis

Mathematical Concepts

Geometry
Coordinate Transformations
Reflections
Translations

Formulas

Reflection over the y-axis: (x, y) -> (-x, y)
Translation: (x, y) -> (x+a, y+b)

Theorems

Properties of Reflections in Geometry
Translation in the Coordinate Plane

Suitable Grade Level

Grades 8-10