Answer:
D'(4,-4), E'(5,-1), F'(8,0)
Step-by-step explanation:
After plotting DEF on a graph, individually move each plot point to the slope -2/1.
3 × (2 + 3 + 5)
3x^2 = 24
devide by 3
x^2 = 8
x =2.828427125