7.2 Elimination

Today we explored different ways to accomplish the same goals of solving two equations with two different variables. This is seen as an alternative root to substitution. There are 4 steps to this process.

1) obtain coefficients that differ only in sign.

2) add equations to eliminate a variable 

3) back substitute to solve for a second equation 

4) check you solution

Here is an example of how to do elimination. A few notes about the process:

1) it does not matter which equation you substitute back into. 

2) it does not matter which variable you decide to eliminate.

3) check using equation 1

We also learned how to do distance formulas while accounting for wind and the speed of the plain.the formulas for this was d=rt with the rate being p+w and p-w. you solve this just like an elimination formula!