Linear Equations and Function Graphs

Linear Equations and Function Graphs
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2017-08-06 21:56
This example demonstrates how to use GeoGebra to graph systems of linear equations and analyze their solutions. Key mathematical concepts include linear equations, function graphs, and continuity. Using commands like LaTeX, Sequence, and TableText, users can dynamically adjust coefficients and observe changes in the solutions. Suitable for high school mathematics education and learning.

GeoGebra Commands & Parameters

  1. LaTeX(steps) → counter
  2. LaTeX("\text{Move the slider to solve the problem.}") → text0
  3. LaTeX("\text{Use the buttons below to return to the original}\cr\text{problem or randomly generate a similar practice}\cr\text{problem.}") → RandomizationText
  4. Corner(2, 3) → topright
  5. Corner(2, 1) → bottomleft
  6. If(const > 0, "+", "-") → constSign
  7. If(choose ≟ 0, LaTeX[(((("a_n=" * coef) * "n") * constSign) * absConst)], LaTeX[(((((("a_n=" * coef) * "a_{n-1}") * constSign) * absConst) * "\text{ and }a_0=") * const)]) → formula
  8. If(choose ≟ 0, explicit, recursive) → sequenceVals
  9. Sequence((n(j), sequenceVals(j)), j, 1, graphterms) → plotPoints
  10. LaTeX("\text{Determine whether this is an explicit formula or a}\cr\text{recursive formula.}") → text1
  11. LaTeX((((((("\text{Find and graph the first " * graphterms) * " terms, starting with }\textcolor{#000099}{n=1}\text{,}\cr\text{of the sequence given by the formula }\cr\textcolor{#000099}{") * formula) * "}\text{,}\cr\text{where }\textcolor{#000099}{a_n}\text{ is the value of the term and }\textcolor{#000099}{n}\text{ is the term}\cr\text{number. Then find the ") * finalterm) * "th term.}")) → Problem
  12. If(choose ≟ 0, LaTeX["\text{This is an explicit formula because the right hand}\cr\text{side depends only on }\textcolor{#000099}{n}\text{ and not on }\textcolor{#000099}{a_{n-1}}\text{ or similar}\cr\text{terms.}"], LaTeX["\text{This is a recursive formula because the right hand}\cr\text{side depends on }\textcolor{#000099}{a_{n-1}}\text{ and we are given an initial}\cr\text{term, }\textcolor{#000099}{a_0}\text{.}"]) → text2
  13. LaTeX((("\text{Find the first " * graphterms) * " terms of the sequence.}")) → text3
  14. If(choose ≟ 0, Sequence[LaTeX[(((((((((("a_" * k) * "=") * coef) * "(") * k) * ")") * constSign) * absConst) * "=") * sequenceVals(k))], k, 1, graphterms], Append[LaTeX[(((((((("a_1=" * coef) * "(") * const) * ")") * constSign) * absConst) * "=") * sequenceVals(1))], Sequence[LaTeX[(((((((((("a_" * k) * "=") * coef) * "(") * sequenceVals(k - 1)) * ")") * constSign) * absConst) * "=") * sequenceVals(k))], k, 2, graphterms]]) → firstTerms
  15. LaTeX((("\text{Substitute the respective values for }\textcolor{#000099}{n=1}\text{ through }\cr\textcolor{#000099}{n=" * graphterms) * "}\text{.}")) → text4
  16. LaTeX(formula) → text4b
  17. TableText({firstTerms}, "v") → text4c
  18. Sequence(sequenceVals(k), k, 1, graphterms - 1) → shortList
  19. LaTeX("\text{Create ordered pairs from the sequence.}") → text5
  20. LaTeX("\text{The first coordinate is }\textcolor{#000099}{n}\text{ and the second coordinate}\cr\text{is }\textcolor{#000099}{a_n}\text{.}") → text6
  21. LaTeX("\text{Plot the ordered pairs.}") → text8
  22. LaTeX((("\text{Find the " * finalterm) * "th term in the sequence.}")) → text9
  23. If(choose ≟ 0, LaTeX[(((("\text{Since the sequence is explicitly defined, evaluate}\cr\text{the formula, }\textcolor{#000099}{" * formula) * "}\text{ at }\textcolor{#000099}{n=") * finalterm) * "}\text{.}")], LaTeX[(("\text{Since the sequence is recursively defined, continue}\cr\text{building up to the " * finalterm) * "th term one term at a time.}")]) → text10a
  24. Sequence(sequenceVals(k), k, 1, graphterms) → graphedList
  25. Max(0, Max[graphedList]) → maxy
  26. Sequence(LaTeX[(((((((((("a_" * k) * "=") * coef) * "(") * sequenceVals(k - 1)) * ")") * constSign) * absConst) * "=") * sequenceVals(k))], k, graphterms + 1, finalterm) → moreTerms
  27. If(choose ≟ 0, LaTeX[(((((((((("a_" * finalterm) * "=") * coef) * "(") * finalterm) * ")") * constSign) * const) * "=") * sequenceVals(finalterm))], TableText[{moreTerms}, "v"]) → text10b
  28. LaTeX((((("\text{The " * finalterm) * "th term in the sequence is ") * sequenceVals(finalterm)) * ".}")) → text10c
  29. LaTeX((((((("\text{" * text10a) * "}\cr\textcolor{#000099}{") * text10b) * "}\cr\text{") * text10c) * "}")) → text10
  30. LaTeX((((((("\text{The first " * graphterms) * " values are ") * shortList) * "}\cr\text{and ") * sequenceVals(graphterms)) * ".}")) → text4d
  31. TableText({Append[LaTeX["(n,a_n)"], plotPoints]}, "v") → text7
  32. Min(0, Min[graphedList]) → miny