Draw the graph of `y=2^(-x)`.

Explanation

To draw the graph of the function \( y = 2^{-x} \), we will follow these steps:

### Step 1: Determine key values of \( y \) for selected \( x \) values
We will calculate the values of \( y \) for various \( x \) values, both positive and negative.

- For \( x = 0 \):
\[
y = 2^{-0} = 1
...