Reflect the figure below across the y-axis, then dilate about the origin by a scale factor of 3. Determine the coordinates of A’’ and B’’.
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Answer:
A''(15, 12) and B''(- 21, - 6)
Step-by-step explanation:
1). Reflection across the y-axis:
A(- 5, 4) ------> A'(5, 4)
B(7, - 2) ------> B'(- 7, - 2)
AB = A'B'
2). Dilation about the origin:
A'(5, 4) ------> A''(5×3, 4×3) = A''(15, 12)
B'(- 7, - 2) ------> B''(- 7×3, - 2×3) = B''(- 21, - 6)
A''B'' = 3A'B'
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