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Given the ordered pair [tex]\((1, -3)\)[/tex], where will the transformed image be after the following composition: [tex]\(D_2 \circ R_{y\text{-axis}}\)[/tex]?

Sagot :

Let's consider the transformations one by one on the given ordered pair [tex]\((1, -3)\)[/tex]:

1. Reflection across the y-axis:
- To reflect a point across the y-axis, we take the point [tex]\((x, y)\)[/tex] and transform it to [tex]\((-x, y)\)[/tex].
- Therefore, reflecting [tex]\((1, -3)\)[/tex] across the y-axis results in:
[tex]\[ (-1, -3) \][/tex]

2. Dilation with a scale factor of 2:
- To dilate a point by a scale factor of 2, we multiply both the [tex]\(x\)[/tex] and [tex]\(y\)[/tex] coordinates by 2.
- Applying this dilation to the reflected point [tex]\((-1, -3)\)[/tex] results in:
[tex]\[ (2 \times -1, 2 \times -3) = (-2, -6) \][/tex]

After performing these transformations, the coordinates of the transformed image are [tex]\((-2, -6)\)[/tex].

Therefore, the ordered pairs after each transformation step are:
1. After reflection across the y-axis: [tex]\((-1, -3)\)[/tex]
2. After dilation by a scale factor of 2: [tex]\((-2, -6)\)[/tex]