Answer:
The ordered pair (-3,64) lies on the graph
The value of y=64
Explanation:
we know that
If a ordered pair lies on the graph of y
then
the ordered pair must satisfy the equation of y
In this problem we have

For x=-3
substitute the value of x in the exponential equation

therefore
The ordered pair (-3,64) lies on the graph
The value of y=64
see the attached figure to better understand the problem