Here are larger versions of 3 figures given in the article "Jiu Zhang Suan Shu and the Gauss Algorithm for Linear Equations", by Ya-Xiang Yuan, Documenta Mathematica, Extra Volume ISMP (2012) 9-14.

Figure 1: Liu Hui 225-295, edited and published the Nine Chapters (Jiu Zhang Suan Shu) in 263. Here is the problem

  3x+2y+z=39 
  2x+3y+z=34
  x+2y+3z=26

Figure 2: Problem 1, Chapter 8 of Jiu Zhang Suan. There are three grades of grain: top, medium and low. Three sheaves of top-grade, two sheaves of medium-grade and one sheaf of low-grade are 39 Dous 4 . Two sheaves of top-grade, three sheaves of medium-grade and one sheaf of low-grade are 34 Dous. One sheaf of top-grade, two sheaves of medium-grade and three sheaves of low-grade are 26 Dous. How many Dous does one sheaf of top-grade, medium-grade and low-grade grain yield respectively.
Figure 3: Gaussian Elimination Algorithm descriptions in Chapter 8

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Math21b Harvard College Class Number:16325 Course ID:110989| Oliver Knill | Spring 2016 | Department of Mathematics | Faculty of Art and Sciences | Harvard University, [Canvas, for admin], Twitter