Series Content INTRO 丟番圖 | Diophantus LESSON 1 二元一次方程的圖像 | Linear Equations in Two Unknowns on Graphs LESSON 2 聯立方程 (圖解法) | Simultaneous Equations in Two Unknowns (Graphical Method) LESSON 3 聯立方程 (代數法) | Simultaneous Equations in Two Unknowns (Algebraic Method) LESSON 4 聯立方程的兩個特例 | 2 Special Cases of Simultaneous Equations in Two Unknowns LESSON 5 聯立方程應用 | Application of Simultaneous Equations in Two Unknowns ADD-ON 多元聯立方程又點? | What about Simultaneous Equations in Many Unknowns?