malibu777
09.04.2021 •
Mathematics
According to the U.S. Geological Survey, there are over 332,519,000 cubic miles of water on the planet. Write this number in scientific notation.
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Ответ:
X=9
Y=-9
Step-by-step explanation:
3x - 4y =9
-3x +2y=9 cross 3x and - 3x since they're opposite ــــــــــــــــــــــــ
-4y +2y =9 +9
-2y =18
Y =-18/2
Y= -9
Replace y in the first equation:
3x - 4 (-9)=9
3x +36=9
3x = 27
X= 27/3
X= 9
Hope this helps you.. Good luck