Dilated the figure by a factor of 1/2 (centered at the origin)

Step-by-step explanation:
plot the point a in (-1,1)
plot the point b in (1.5,1.5)
plot the point c in (1,0.5)
hope it helps
multiplying each coordinated by 1/2
example is point a
x coordinate:
1/2(-2)
=-1
y coordinate
1/2(2)
=1