Question 614498
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*[tex \LARGE \ \ \ \ \ \ \ \ \ \ 2x\ +\ y\ =\ 5]


*[tex \LARGE \ \ \ \ \ \ \ \ \ \ x\ -\ 2y\ =\ 10]


*[tex \LARGE \ \ \ \ \ \ \ \ \ \ y\ =\ 5\ -\ 2x]


*[tex \LARGE \ \ \ \ \ \ \ \ \ \ x\ -\ 2(5\ -\ 2x)\ =\ 10]


Step above, good.  Step below: Sign Error.


*[tex \LARGE \ \ \ \ \ \ \ \ \ \ x\ +\ 10\ +\ 4x\ =\ 10]


*[tex \LARGE \ \ \ \ \ \ \ \ \ \ 5x\ +\ 10\ =\ 10]


*[tex \LARGE \ \ \ \ \ \ \ \ \ \ 5x\ =\ 0]


*[tex \LARGE \ \ \ \ \ \ \ \ \ \ x\ =\ 0]


*[tex \LARGE \ \ \ \ \ \ \ \ \ \ 2(0)\ +\ y\ =\ 5]


*[tex \LARGE \ \ \ \ \ \ \ \ \ \ y\ =\ 5]


Should be:


*[tex \LARGE \ \ \ \ \ \ \ \ \ \ x\ -\ 10\ +\ 4x\ =\ 10]


*[tex \LARGE \ \ \ \ \ \ \ \ \ \ 5x\ -\ 10\ =\ 10]


*[tex \LARGE \ \ \ \ \ \ \ \ \ \ 5x\ =\ 20]


*[tex \LARGE \ \ \ \ \ \ \ \ \ \ x\ =\ 4]


*[tex \LARGE \ \ \ \ \ \ \ \ \ \ 2(4)\ +\ y\ =\ 5]


*[tex \LARGE \ \ \ \ \ \ \ \ \ \ y\ =\ -3]


John
*[tex \LARGE e^{i\pi}\ +\ 1\ =\ 0]
My calculator said it, I believe it, that settles it
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