In the Create panel > Shapes > Splines category, choose Line as Object Type and draw a shape as shown in the pciture (in Top viewport). It will be the shape for our Slide.
Then again in the same viewport, draw a straight line as you can see in the picture. It will drive the shape for the Slide.
Now while Line02 is selected, go to Vertex Sub-Object mode and click Refine button under the Geometry roll-out in the Modify panel. We will use it for adding more vertices to the line.
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