Find the scale factor of the line segment dilation. ab: endpoints (−1, −2) and (−2, −4) to a'b': endpoints at (−2, −4) and (−4, −8).

In AB, we know that they're both negative, so in A'B' they're also negative, so the scale factor can not be negative. Point A is multiplied by 2 to get -2, just like point B which is also multiplied by 2 to get -4. The scale factor should be 2.