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AleksAgata [21]
3 years ago
6

Sometimes two transformations, one performed after the other, have a nice description as a single transformation. For example, i

nstead of translating 2 units up followed by translating 3 units up, we could simply translate 5 units up. Instead of rotating 20 degrees counterclockwise around the origin followed by rotating 80 degrees clockwise around the origin, we could simply rotate 60 degrees clockwise around the origin.
Can you find a simple description of reflecting across the x-axis followed by reflecting across the y-axis?
Mathematics
1 answer:
almond37 [142]3 years ago
6 0

Answer:

We rotate the point counterclockwise by an angle θ = tan⁻¹ (y/x)

Step-by-step explanation:

If we have the point (x, y), its reflection along the x-axis (x,-y). The reflection of the point (x, -y) along the y - axis is (-x, -y). So, the angle between the initial point (x, y) and the final point (-x, -y) is θ = tan⁻¹ [(-y - y)/(- x -x)] = tan⁻¹ [(-2y/(-2x)] =  tan⁻¹(y/x).

So, the point (x, y) is rotated counterclockwise by an angle of  θ = tan⁻¹ (y/x) to perform both reflections.

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28

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Quin made three and four sevenths jugs of sweet tea. She sold two and one third jugs at her sweet tea stand. How much sweet tea
Lera25 [3.4K]

Answer:\frac{23}{21}\ \text{Jugs of tea}

Step-by-step explanation:

Given

Quin made three and four seventh jugs of sweet tea i.e. 3 \frac{4}{7}=\frac{3\times 7+4}{7}=\frac{25}{7}\ jugs

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8 0
3 years ago
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