利用截距找垂直线方程

GeoGebra 命令及参数

1. RandomElement({-5, -3, 3, 5, -7, 7}) → xint
2. RandomElement({-8, -4, -2, 2, 4, 8}) → yint
3. Text(If[slope > 0, "-", ""]) → slopeperpsign
4. FractionText(abs(perpslope)) → slopeperpfraction
5. FractionText(abs(slope)) → slopefraction
6. Text(If[slope < 0, "-", ""]) → slopesign
7. Shuffle(yintsigns) → shuffleyintsigns, {"+", "-"}
8. Shuffle(choices) → shuffledchoices, {"y= \frac{ 5 }{ 2 } x-2", "y=- \frac{ 5 }{ 2 } x+2", "y= \frac{ 2 }{ 5 } x-2", "y=- \frac{ 2 }{ 5 } x+2"}
9. Append("$\textsf{Choose one}$", shuffledchoices) → userinput
10. Corner(5) → dims