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A point has the coordinates [tex]$(m, 0)$[/tex] and [tex]$m \neq 0$[/tex].

Which reflection of the point will produce an image located at [tex]$(0, -m)$[/tex]?

A. A reflection of the point across the [tex]$x$[/tex]-axis
B. A reflection of the point across the [tex]$y$[/tex]-axis
C. A reflection of the point across the line [tex]$y = x$[/tex]
D. A reflection of the point across the line [tex]$y = -x$[/tex]


Sagot :

To determine which reflection of the point \((m, 0)\) will produce an image located at \((0, -m)\), we need to analyze the effects of reflecting a point across different lines.

1. Reflection across the \(x\)-axis:
- Reflecting a point \((a, b)\) across the \(x\)-axis results in the point \((a, -b)\).
- For the point \((m, 0)\), reflecting across the \(x\)-axis would give us \((m, 0)\), which is the same point. This does not match the image \((0, -m)\).

2. Reflection across the \(y\)-axis:
- Reflecting a point \((a, b)\) across the \(y\)-axis results in the point \((-a, b)\).
- For the point \((m, 0)\), reflecting across the \(y\)-axis would give us \((-m, 0)\). This result is also not \((0, -m)\).

3. Reflection across the line \(y = x\):
- Reflecting a point \((a, b)\) across the line \(y = x\) results in the point \((b, a)\).
- For the point \((m, 0)\), reflecting across the line \(y = x\) would give us the point \((0, m)\). This does not match our target image \((0, -m)\).

4. Reflection across the line \(y = -x\):
- Reflecting a point \((a, b)\) across the line \(y = -x\) results in the point \((-b, -a)\).
- For the point \((m, 0)\), reflecting across the line \(y = -x\) would transform it to \((0, -m)\). This is the correct image we are looking for.

Thus, the reflection of the point \((m, 0)\) that produces the image \((0, -m)\) is across the line \(y = -x\).

Therefore, the correct answer is:
- A reflection of the point across the line [tex]\(y = -x\)[/tex].