After a dilation with a center of (0, 0), a point was mapped as (2, –5) → (3, y). A student determined y to be –2.5. Evaluate the student's

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After a dilation with a center of (0, 0), a point was mapped as (2, –5) → (3, y). A student determined y to be –2.5. Evaluate the student's

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After a dilation with a center of (0, 0), a point was mapped as (2, –5) → (3, y). A student determined y to be –2.5. Evaluate the student's answer. A. The student is correct. B. The student incorrectly calculated the scale factor as 0.5. C. The student incorrectly divided by the scale factor instead of multiplying by it. D. The student incorrectly added the scale factor instead of multiplying by it.

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I believe B is the correct choice

(2, -5) → (3, y)

To get the new x coordinate we multiplied 2 by a scale factor of 1.5

So -5 * 1.5 should = -7.5 instead of -2.5

CPhill Oct 9, 2014

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CPhill · Answer 1 · 2014-10-09T04:55:36

I believe B is the correct choice

(2, -5) → (3, y)

To get the new x coordinate we multiplied 2 by a scale factor of 1.5

So -5 * 1.5 should = -7.5 instead of -2.5

After a dilation with a center of (0, 0), a point was mapped as (2, –5) → (3, y). A student determined y to be –2.5. Evaluate the student's

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After a dilation with a center of (0, 0), a point was mapped as (2, –5) → (3, y). A student determined y to be –2.5. Evaluate the student's

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