Describe how the graph of y= x2 can be transformed to the graph of the given equation. (2 points)
y = x2 - 20
Shift the graph of y = x2 left 20 units.
Shift the graph of y = x2 up 20 units.
Shift the graph of y = x2 down 20 units.
Shift the graph of y = x2 right 20 units.