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Mathematics
OpenStudy (anonymous):

Breann solved the system of equations below. What mistake did she make in her work? 2x + y = 5 x − 2y = 10 y = 5 − 2x x − 2(5 − 2x) = 10 x − 10 + 4x = 10 5x − 10 = 10 5x = 20 x = 4 2(4) + y = 5 y = −3 She should have substituted 5 + 2x She combined like terms incorrectly, it should have been 4x instead of 5x She subtracted 10 from both sides instead of adding 10 to both sides She made no mistake

OpenStudy (turingtest):

I see no mistakes

OpenStudy (anonymous):

agreed

OpenStudy (anonymous):

Sorry, that is no answer. The real answer here is that you should plug the values of x and y in the original equations and see if the two equations satisfy. If they do, then there is no mistake. That is the ONLY way to confirm there is no mistake.

OpenStudy (anonymous):

So, plug in x = 4 and y = -3 in the original two equations.

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