Given the system of linear equations. Choose all of the options that could be used to solve the system using addition
{x+y=7
{2x+y=5
Multiply the first equation by 2 and the second equation by -1, then add the equations together.
Multiply the first equation by -1 and add the equations together.
Multiply the second equation by -1 and the first equation by -1, then add the equations together.
Multiply the first equation by -2 and add the equations together.
Multiply the second equation by -1 and add the equations together
Multiply the first equation by 2 and the second equation by -1, then add the equations together.
Multiply the first equation by -1 and add the equations together.
Multiply the second equation by -1 and the first equation by -1, then add the equations together.