二元一次方程的圖像 | Linear Equations in Two Unknowns on Graphs

影片內容：

00:05 – 咩係二元一次方程? | what are linear equations in two unknowns?
01:05 – 兩個未知數的關係 | relations between the two unknowns
02:09 – 點用圖像表示二元一次方程? | how to plot a linear equation in two unknowns on a graph?