😃9.1 二元一次不等式

利用x截距，y截距畫出直線

https://www.geogebra.org/m/vRtQGEYk

輸入x截距，y截距，檢驗是否正確，然後畫出直線並檢驗。

https://www.geogebra.org/m/bnzawbxp

https://www.geogebra.org/m/JpYWwQjs

https://www.geogebra.org/m/dudJx9VE

https://www.geogebra.org/m/CcBHdCEz

https://www.geogebra.org/m/pcx324hc