Answer:
12
Step-by-step explanation:
yes they are congruent.
first flip the A-D shape over the y axis and then the x axis and you should have the same shape.
4=x
y=-x+4
y=2x-8
-x+4=2x-8
+x +x
4=3x-8
+8 +8
12=3x
/3 /3
68
