Answer:
The coordinates of the vertices of triangle A'B'C' are
,
and
.
Step-by-step explanation:
According to this statement, triangle ABC must be translated 5 units in the -y direction to form triangle A'B'C'. We need to use the following operations:
(1)
(2)
(3)
If we know that
,
and
, then the new vertices of the rectangle are, respectively:
,
, 
Any value? you could use 0 or 1 or 2. All three of these are a group of many that would wokr. Any would work!