determine the scale factor used in the dilation of line AB, with a center point of dilation at the origin.

a 3
b -1/3
c 1/3
d -3

To determine the scale factor of a dilation, we need to compare the lengths of the original line and the image line after dilation.

Since the center point of dilation is at the origin, the image of line AB will be along the same line passing through the origin. Therefore, we can compare the lengths of line AB and the image line by finding the ratio of their lengths.

To find the length of line AB, we need to know the coordinates of points A and B. Without this information, we cannot determine the scale factor.