Line AB

contains point A(−4, 1)
and point B (−1, 3)
. Find the coordinates of A′
and B′
after a dilation with a scale factor of 2 with a center point of dilation at the origin.(1 point)
Responses

A′ (−8, 2)
and B′ (2, −6)

A′ (−5, −2)
and B′ (−2, 6)

A′ (8, −2)
and B′ (2, −6)

A′ (−8, 2)
and B′ (−2, 6)

1 answer

To find the coordinates of points A' and B' after a dilation with a scale factor of 2 with the center of dilation at the origin (0, 0), we can use the following formula for dilation:

\[ (x', y') = (k \cdot x, k \cdot y) \]

where \( (x, y) \) are the original coordinates, \( (x', y') \) are the new coordinates after dilation, and \( k \) is the scale factor.

For point A(−4, 1):

  • The coordinates after dilation will be: \[ A' = (2 \cdot -4, 2 \cdot 1) = (-8, 2) \]

For point B(−1, 3):

  • The coordinates after dilation will be: \[ B' = (2 \cdot -1, 2 \cdot 3) = (-2, 6) \]

Therefore, after the dilation, the coordinates of points A' and B' are:

A′ (−8, 2) and B′ (−2, 6).

So the correct response is:

A′ (−8, 2) and B′ (−2, 6).