"The Nine Chapters on the Mathematical Art" was one of the most influential of all Chinese mathematical books and it is composed of 246 problems. It was later incorporated into "The Ten Computational Canons", which became the core of mathematical education in later centuries. This book includes 246 problems on surveying, agriculture, partnerships, engineering, taxation, calculation, the solution of equations, and the properties of right triangles. "The Nine Chapters" made significant additions to solving quadratic equations in a way similar to Horner's method. It also made advanced contributions to "fangcheng" or what is now known as linear algebra. Chapter seven solves system of linear equations with two unknowns using the false position method, similar to The Book of Computations. Chapter eight deals with solving determinate and indeterminate simultaneous linear equations using positive and negative numbers, with one problem dealing with solving four equations in five unknowns. The Nine Chapters solves systems of equations using methods similar to the modern Gaussian elimination and back substitution.