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Given the system of linear equations.
\left \{ {{x+y=7} \atop {2x+y=5}} \right.
Choose all of the options that could be used to solve the system using addition

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.

Given the system of linear equations left xy7 atop 2xy5 right Choose all of the options that could be used to solve the system using addition Multiply the first class=

Respuesta :

texaschic101
x + y = 7
2x + y = 5

multiply 1st equation by -1, then add equations --- this is correct
multiply 2nd equation by -1, then add equations -- this is correct
multiply 1st equation by -2, then add equations -- this is correct
multiply 1st equation by 2 and 2nd equation by -1, then add -- correct

It appears all but 1 of the answer choices will work


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