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=
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 second equation by - 1 and add the equations together.
Multiply the first equation by - 2 and add the equations together.
Multiply the first equation by 2 and the second equation by - 1, then add the equations together
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