Question 1080602
Everything shrank,
and I do nos need to know where the dilation is centered.
Distance AB was 8, and distance A'B' is 2,
so the dilation factor is {{{2/8=1/4}}} .
 
Knowing the center, I would say that points A and B,
with {{{y = y[center]-4}}} have images
with {{{y = y[center]-1}}} ,
so that makes the dilation factor {{{1/4}}} .