One of the algebraic methods for solving systems of equations is to solve by substitution.  It is based on the idea that if a = b, and b = 25, then you can also say that a = 25.

Sounds simple, right?  Imagine a more complicated scenario:

 therefore

And then the equation can be solved for x.

Resources:

  • Notes

Assignment

  • p475 #1, 3, 4-9, 11, 13, 14, 17-20, 25 *21 22 24

 Things you should be able to do after today:

  • solve a system of equations by substitution
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Download this file (10.9.1.notes.substitution.pdf)10.9.1.notes.substitution.pdf 469 kB

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