your mother has a new cell phone. it comes with 18 applications already installed. she only uses 2/3 of those applications. she downloaded an additional 12 applications that she uses regularly. write an equation to represent the total number of applications your mom uses. explain equation and your reasoning.

solve systems of equations by graphing. a system of linear equations contains two or more equations e.g. y=0.5x+2 and y=x-2. the solution of such a system is the ordered pair that is a solution to both equations. to solve a system of linear equations graphically we graph both equations in the same coordinate system