This week in math I learned how to do substitution. Substation is a method on how to find the X and the Y variables in an equation. The first step is looking at the 2 equations and seeing if there is any that can cancel each other out (a negative and a positive) if not you have to multiply everything to make one of the numbers to cancel each other out. Once you do that you solve as usual to get your first variable value. When you find your first you plug it in to one of the original equations to find the next variable. When you have found both X and Y you plug them into both the equations to check and see you have gotten it right.