If a figure is dilated by a scale factor of 3, what were the coordinates of the pre-image of W '(9, -3)?

W(6, -6)
W(12, 0)
W(27, -9)
W(3, -1)

Question

If a figure is dilated by a scale factor of 3, what were the coordinates of the pre-image of W '(9, -3)?

W(6, -6)
W(12, 0)
W(27, -9)
W(3, -1)

anonymous · Answer

A scale factor means that the original, pre-image, was multiplied by a factor to dilate it. In this case, the scale factor is 3. That means that every coordinate of the pre-image was multiplied by 3 to dilate it. Just do the opposite to get the pre-image from the dilated image.

You have to divide each of these coordinate values by 3 to get the original image's coordinates.