线性图与其方程的关系（斜截式）

GeoGebra 命令及参数

1. Line(B, P_{1}) → f
2. Intersect(f, yAxis) → C
3. Slope(f) → m
4. If(Defined[Line[B, P_{1}]], true, false) → lineexists
5. If(x(P_{1}) < x(B), Vector[P_{1}, N], Vector[N, P_{1}]) → v
6. If(x(P_{1}) > x(B), Vector[B, N], Vector[N, B]) → u
7. If(m < 0, If[x(P_{1}) ≤ x(B), y(N) - y(P_{1}), y(N) - y(B)], If[x(P_{1}) ≤ x(B), y(B) - y(N), y(P_{1}) - y(N)]) → rise
8. If(m ≤ 0, If[x(P_{1}) ≤ x(B), x(B) - x(N), x(P_{1}) - x(N)], If[x(P_{1}) ≤ x(B), x(N) - x(P_{1}), x(N) - x(B)]) → run
9. GCD(rise, run) → a
10. Point(f) → P
11. CoordPointertoAxes7a(P) → w, e, text12, text13, text14, text15, text16, A, D
12. CoordPointertoAxes7a(Q) → h, i, text17, text18, text19, text20, text21, E, F