https://en.wikipedia.org/wiki/System_of_linear_equations

This week in math we learned about systems of linear equations. They are a set of two linear equations with two variables. The two ways we learned to solve them are by substitution and elimination. For the substitution method, you try and isolate a variable by moving it to one side and having the rest of the equation on the other. You then can put your equation into the other by inserting the variable you have isolated with the other side of the equation. From there you solve the equation until you get a variable = a number.

The other method is elimination. For this method, you have to find or create a zero pair with one of the variables by multiplying or dividing the entire equation. Once you have a zero pair, you can subtract one equation from another to have a single equation. Finally, you simplify the equation until you get a variable = a number

https://en.wikipedia.org/wiki/System_of_linear_equations