Plot the points and compute the slope of the line containing them.
`(-1,2),(-1,-2)`

Explanation

To solve the problem of plotting the points and computing the slope of the line containing them, we will follow these steps:

### Step 1: Plot the Points
We are given two points:
- Point A: (-1, 2)
- Point B: (-1, -2)

To plot these points on a Cartesian coordinate system:
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