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Mathematics 15 Online
OpenStudy (anonymous):

Carlos solved the system of equations below. What mistake did he make in his work? 2x + y = 5 x − 2y = 10 y = 5 − 2x x − 2(5 − 2x) = 10 x + 10 + 4x = 10 5x + 10 = 10 5x = 0 x = 0 2(0) + y = 5 y = 5 a)He should have substituted 5 + 2x b)He did not distribute correctly C)He combined like terms incorrectly, it should have been 4x instead of 5x d)He made no mistake

OpenStudy (anonymous):

Take a look here: x − 2(5 − 2x) = 10 x + 10 + 4x = 10 the mistake is in there somewhere. Tell me what you think.

OpenStudy (anonymous):

idk?

OpenStudy (anonymous):

Here's an example. - 5(4 + x) --> -20 - 5x See how the negative was distributed? This is called the distributive property. Now what do you think it is?

OpenStudy (anonymous):

he did not distribute correctly?

OpenStudy (anonymous):

Yeah

OpenStudy (anonymous):

thanks

OpenStudy (anonymous):

np :)

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