Answer:
If AB and CD are perpendicular, (slope of AB) x (slope of CD) = -1
9/a = -1
a = -9

The answer is....

Hopefully, this helps you!

Answer:
it is an enlargement with a scale factor greater than one.
Step-by-step explanation:
you can tell this, because the pre-image is smaller than the image, and its more than double the size :)
Answer:
It would be B & E
Step-by-step explanation:
but how can we determine if there is no pic