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igomit [66]
3 years ago
13

X+7z=16 3x+y=8 y-7z=-12

Mathematics
1 answer:
svet-max [94.6K]3 years ago
8 0

x = 16 - 7z  \\ \ \\ \ 3(16 - 7z) = 8 \\ 48 - 21z = 8 \\  - 21z =  - 40 \\ z =  \frac{40}{21}  \\  \\  \\ y   - 7( \frac{40}{21} ) =  - 12 \\ y -  \frac{40}{3}  =  - 12 \\ y =  - 12 +  \frac{40}{ 3}  \\ y =  \frac{4}{3}
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