MathBits.com Table of Contents
Solving Equations

The graphing calculator can be easily used to solve and/or check algebraic equations.
 

Example 1:    Solve for x:   4x + 1 = 9
  • Enter the left side of the equation into Y1.
  • Enter the right side of the equation into Y2.
  • Graph  (you may need to adjust your window to see where the two graphs intersect)
  • Find the point of intersection (the answer).
    (2nd CALC (above TRACE), #5 Intersect)
  • Answer:   x = 2

 

Example 2:    Solve for x:   2x + 4 = 5x - 2

  • Answer:   x = 2

 

Example 3:    Solve for x:   x2 + x = x2 - 2x + 6

  • Answer:  x = 2

 

Example 4:.   Solve for x:   15x - 3(3x + 4) = 6.  Choose the correct value for x.

 1) 1       (2)        (3) 3       (4)

 



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