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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 \{ {{x+y=7} \atop {2x+y=5}} \right. Choose-example-1
User Yanira
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1 Answer

1 vote
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


User Subscriberius
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