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egoroff_w [7]
3 years ago
14

4x+y=23 3x-y=12 how to do do this

Mathematics
1 answer:
3241004551 [841]3 years ago
4 0
\left \{ {{4x+y=23} \atop {3x-y=12}} \right. \\+---\\add\ both\ equations\\\\
7x=35\ \ \ | divide\ by \ 7\\\\
x=5\\\\
y=23-4x=23-4*5=23-20=3
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