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OpenStudy (anonymous):
Someone explain this: http://tutorial.math.lamar.edu/Extras/AlgebraTrigReview/SolveSystems.aspx the first problem..
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OpenStudy (anonymous):
where does the -2 come from???
OpenStudy (anonymous):
he multiplied by -2 so the z's could be negative to each other, so when he added them together, they would cancel out
OpenStudy (anonymous):
Why not -1?
OpenStudy (anonymous):
Silly, nevermind!
OpenStudy (anonymous):
because then it would be 4z -2z and that wouldnt cancel out
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OpenStudy (anonymous):
Thanks haha I realized that ...Im on an empty stomach lol
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