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Linear Inequalities Interactive Demo: Dynamic Input and Graphical Verification

Linear Inequalities Interactive Demo: Dynamic Input and Graphical Verification
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2016-03-28 06:58
FunctionInequalityGeometric ConstructionGraphing
This GeoGebra example demonstrates the graphical representation and verification of linear inequalities through an interactive interface. It uses multiple text fields (inputBox1 to inputBox6) for users to input coefficients and constants, generating corresponding linear inequality regions in real time, with sign functions (sgn_1 etc.) and text labels (text1 etc.) indicating the direction of each inequality. Core mathematical concepts include linear inequalities, half-planes, boundary lines, and solution sets. The construction employs commands such as Textfield, If, and TextToUnicode to handle input and conditional logic, combined with various objects (t_1, S_1, c_1, etc.) to build dynamic graphics, also incorporating geometric elements like incircle and kite, but primarily focusing on visualizing inequality regions. Suitable for middle and high school students learning linear inequalities, and useful for classroom demonstrations or self-exploration to understand the geometric meaning of solution sets.

GeoGebra Commands & Parameters

  1. Textfield(m_1) → inputBox1
  2. Textfield(c_1) → inputBox2
  3. Textfield(m_2) → inputBox3
  4. Textfield(c_2) → inputBox4
  5. If(S_1 ≟ 1, If[t_1, "≥", ">"], If[S_1 ≟ -1, If[t_1, "≤", "<"], "="]) → sgn_1
  6. If(S_1 ≟ 1, y > f_1(x), If[S_1 ≟ -1, y < f_1(x), y = f_1(x)]) → C1
  7. If(S_2 ≟ 1, If[t_2, "≥", ">"], If[S_2 ≟ -1, If[t_2, "≤", "<"], "="]) → sgn_2
  8. If(S_2 ≟ 1, y > f_2(x), If[S_2 ≟ -1, y < f_2(x), y = f_2(x)]) → C2
  9. Textfield(c_3) → inputBox5
  10. If(S_3 ≟ 1, y > (0 * x) + c_3, If[S_3 ≟ -1, y < (0 * x) + c_3, y = (0 * x) + c_3]) → C3
  11. If(S_3 ≟ 1, If[t_3, "≥", ">"], If[S_3 ≟ -1, If[t_3, "≤", "<"], "="]) → sgn_3
  12. Textfield(d_1) → inputBox6
  13. If(S_4 ≟ 1, x > (0 * y) + d_1, If[S_4 ≟ -1, x < (0 * y) + d_1, x = (0 * y) + d_1]) → C4
  14. If(S_4 ≟ 1, If[t_4, "≥", ">"], If[S_4 ≟ -1, If[t_4, "≤", "<"], "="]) → sgn_4
  15. Textfield(m_1) → inputBox1_1
  16. Textfield(c_1) → inputBox2_1
  17. TextToUnicode("≤") → q
  18. Textfield(m_2) → inputBox3_1
  19. Textfield(c_2) → inputBox4_1
  20. If(a ∧ b ∧ c ∧ d, C1(x, y) ∧ C2(x, y) ∧ C3(x, y) ∧ C4(x, y), If[a ∧ b ∧ c, C1(x, y) ∧ C2(x, y) ∧ C3(x, y), If[a ∧ b ∧ d, C1(x, y) ∧ C2(x, y) ∧ C4(x, y), If[a ∧ c ∧ d, C1(x, y) ∧ C3(x, y) ∧ C4(x, y), If[b ∧ c ∧ d, C2(x, y) ∧ C3(x, y) ∧ C4(x, y)]]]]) → OverlapOfAll