[plt-scheme] which teachpack contains (make-posn)

I skipped ahead to Chapter 6 in HtDP but that chapter did not specify 
which teachpack contained (make-posn). Loading the draw teachpack worked 
for |


(start 300 300)| ; which opens a canvas;

|but failed for:
|

|(draw-solid-line (make-posn 10 10) (make-posn 110 10) 'red)
|

|because make-posn was undefined.

|

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