Consider the following system with the solution (1,3)
equation 1 of the system : 2x+y=5
equation 2 of the system: x -2y =-5
prove that replacing the first equation with the sum of that equation and a multiple of the other produces a system with the same solution
posible answers : used multiplication property of equality to write a new equation
used addition property of equality to write a new equation added equations 1 and 3