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