C. Solving Systems of Linear Equations Graphically Using Technology

The graph of a linear system is shown. The point of intersection does not lie on a grid intersection, so it is impossible to determine an accurate solution by looking at this graph. The best you can do is say the solution is approximately (0.8, 0.5).

Many graphing calculators and graphing programs allow you to determine the coordinates of a point of intersection with greater precision. In general, you will need to

  • graph the two functions separately.

  • use an 'intersection' command to determine where the lines cross.


For more specific instructions, consult your calculator's manual or enter "solving linear systems using [enter the name of your graphing calculator or program]" into a search engine. More specific instructions for TI-83â„¢ and TI-84â„¢ calculators are provided in the Appendix. If you have difficulty solving systems of linear equations using technology, contact your teacher.