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[tex]$\overline{B^{\prime} C^{\prime}}$[/tex] has endpoints located at [tex]$B^{\prime}(2,0)$[/tex] and [tex]$C^{\prime}(2,6)$[/tex]. [tex]$\overline{BC}$[/tex] was dilated at a scale factor of 2 from the origin. Which statement describes the pre-image?

A. [tex]$\overline{BC}$[/tex] is located at [tex]$B(1,0)$[/tex] and [tex]$C(1,3)$[/tex] and is one-half the size of [tex]$\overline{B^{\prime} C^{\prime}}$[/tex].
B. [tex]$\overline{BC}$[/tex] is located at [tex]$B(2,0)$[/tex] and [tex]$C(2,6)$[/tex] and is the same size as [tex]$\overline{B^{\prime} C^{\prime}}$[/tex].
C. [tex]$\overline{BC}$[/tex] is located at [tex]$B(4,0)$[/tex] and [tex]$C(4,12)$[/tex] and is twice the size of [tex]$\overline{B^{\prime} C^{\prime}}$[/tex].
D. [tex]$\overline{BC}$[/tex] is located at [tex]$B(6,0)$[/tex] and [tex]$C(6,18)$[/tex] and is three times the size of [tex]$\overline{B^{\prime} C^{\prime}}$[/tex].


Sagot :

The given endpoints of [tex]\(\overline{B^{\prime} C^{\prime}}\)[/tex] are [tex]\(B^{\prime}(2,0)\)[/tex] and [tex]\(C^{\prime}(2,6)\)[/tex].

We are told that [tex]\(\overline{BC}\)[/tex] was created by dilating [tex]\(\overline{B^{\prime} C^{\prime}}\)[/tex] from the origin with a scale factor of 2.

To find the pre-image points [tex]\(B\)[/tex] and [tex]\(C\)[/tex], we need to divide the coordinates of [tex]\(B^{\prime}\)[/tex] and [tex]\(C^{\prime}\)[/tex] by the scale factor. Therefore:

1. For point [tex]\(B\)[/tex]:
[tex]\[ B = \left( \frac{B^{\prime}_x}{2}, \frac{B^{\prime}_y}{2} \right) = \left( \frac{2}{2}, \frac{0}{2} \right) = (1, 0) \][/tex]

2. For point [tex]\(C\)[/tex]:
[tex]\[ C = \left( \frac{C^{\prime}_x}{2}, \frac{C^{\prime}_y}{2} \right) = \left( \frac{2}{2}, \frac{6}{2} \right) = (1, 3) \][/tex]

Next, we verify their sizes to ensure that [tex]\( \overline{BC} \)[/tex] is correctly described.

The distance between [tex]\(B^{\prime}\)[/tex] and [tex]\(C^{\prime}\)[/tex] is calculated as:
[tex]\[ B^{\prime}C^{\prime} = \sqrt{(C^{\prime}_x - B^{\prime}_x)^2 + (C^{\prime}_y - B^{\prime}_y)^2} = \sqrt{(2 - 2)^2 + (6 - 0)^2} = \sqrt{0 + 36} = 6 \][/tex]

The distance between [tex]\(B\)[/tex] and [tex]\(C\)[/tex] is:
[tex]\[ BC = \sqrt{(C_x - B_x)^2 + (C_y - B_y)^2} = \sqrt{(1 - 1)^2 + (3 - 0)^2} = \sqrt{0 + 9} = 3 \][/tex]

Since [tex]\( BC \)[/tex] is half the size of [tex]\( B^{\prime}C^{\prime} \)[/tex], we conclude that:

[tex]\[ \overline{BC} \text{ is located at } B(1,0) \text{ and } C(1,3) \text{ and is one-half the size of } \overline{B^{\prime}C^{\prime}}. \][/tex]

Thus, the correct statement is:
[tex]\[ \overline{BC} \text{ is located at } B(1,0) \text{ and } C(1,3) \text{ and is one-half the size of } \overline{B^{\prime}C^{\prime}}. \][/tex]