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OpenStudy (anonymous):
x +2y +5z=15 4x +9y +19z=62 x +8z = 13
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Directrix (directrix):
CW ==> I need to know how your Professor said to do these as in what technique? Look at your book and post the instructions here, please. Great news, there's an online calculator for these three by threes but it doesn't mean anything if a person doesn't understand what is going on. So hit me up with those instructions.
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