Math Problem Statement

The vector ⟨4, 1⟩ describes the translation of A(−1, w) to A′(2x + 1, 4) and B(8y − 1, 1) onto B′(3, 3z). Find the values of w, x, y, and z.

Solution

To solve the problem in the image, we need to carefully analyze the given vector, translation details, and equations implied in the description. Let's break it down step by step:


Problem Details:

  1. Translation Vector: 4,1\langle 4, 1 \rangle

    • This vector represents the movement in the xx- and yy-directions during the translation.
  2. Points Involved:

    • A(1,w)A(2x+1,4)A(-1, w) \to A'(2x + 1, 4)
    • B(8y1,1)B(3,3z)B(8y - 1, 1) \to B'(3, 3z)
  3. Objective:

    • Find the values of ww, xx, yy, and zz.

Translation Relation:

The vector 4,1\langle 4, 1 \rangle means:

  • The xx-coordinate of any point increases by 44.
  • The yy-coordinate of any point increases by 11.

This gives us:

  1. A=A+4,1A' = A + \langle 4, 1 \rangle
  2. B=B+4,1B' = B + \langle 4, 1 \rangle

Equations:

For Point AA:

From A(1,w)A(-1, w) to A(2x+1,4)A'(2x + 1, 4):

  • xx-coordinate: 2x+1=1+42x + 1 = -1 + 4
  • yy-coordinate: 4=w+14 = w + 1

For Point BB:

From B(8y1,1)B(8y - 1, 1) to B(3,3z)B'(3, 3z):

  • xx-coordinate: 3=(8y1)+43 = (8y - 1) + 4
  • yy-coordinate: 3z=1+13z = 1 + 1

Solve for Variables:

  1. From 2x+1=1+42x + 1 = -1 + 4: 2x+1=3    2x=2    x=12x + 1 = 3 \implies 2x = 2 \implies x = 1

  2. From 4=w+14 = w + 1: w=41    w=3w = 4 - 1 \implies w = 3

  3. From 3=(8y1)+43 = (8y - 1) + 4: 3=8y+3    8y=0    y=03 = 8y + 3 \implies 8y = 0 \implies y = 0

  4. From 3z=1+13z = 1 + 1: 3z=2    z=233z = 2 \implies z = \frac{2}{3}


Final Answer:

w=3,x=1,y=0,z=23w = 3, \, x = 1, \, y = 0, \, z = \frac{2}{3}

Let me know if you would like more explanation or if you have further questions!


Expanding Understanding:

Here are 5 related questions for practice:

  1. How do you find a translation vector given two points before and after translation?
  2. How would the equations change if the translation vector was 4,3\langle -4, 3 \rangle?
  3. Can you derive the general formula for translations in 3D space?
  4. What happens if the coordinates include negative values in the vector?
  5. How can you verify the translation is correct for both points?

Tip:

Always write down the translation vector explicitly and apply it systematically to avoid mistakes with signs.

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Math Problem Analysis

Mathematical Concepts

Vectors
Coordinate Geometry
Translations

Formulas

Translation vector ⟨a, b⟩ implies new point (x', y') = (x + a, y + b)

Theorems

Translation in Cartesian coordinates

Suitable Grade Level

Grades 9-12