I got x=2.64 or x=1.32 i don't know if i done it right
You actually have most of the answers correct.
E is the origin
D is the x axis
A is the y axis
B is at coordinates (1, 3)
C is at coordinates (3, 1)
*remember you go across on the graph x axis and then up y axis.
-3 =-2x - 7
Add 7 to both sides
4=-2x
Divide by -2
-2 = x