点斜式：直线方程的绘制

GeoGebra 命令及参数

1. Simplify(y - yc) → f
2. Simplify(x - xc) → g
3. Vector(A, B) → u
4. Vector(B, C) → v
5. Polygon(A, B, C) → t1, c, a, b
6. Textfield(rise) → InputBox1
7. Textfield(run) → InputBox2
8. Random(-9, 9) → num
9. RandomElement(Union[Sequence[i, i, -9, -1, 1], Sequence[i, i, 1, 9, 1]]) → denom
10. FractionText(num / denom) → text4
11. Random(-9, 9) → ycc
12. Random(-9, 9) → xcc
13. Simplify(y - ycc) → h
14. Simplify(x - xcc) → p
15. If(Slope[eq1] ≟ Slope[eq2], "Your slope is correct.", "Your slope is not correct.") → text3
16. If(A ≟ D, "Your point lies on this line.", "Your point does not lie on this line.") → text7