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lukranit [14]
3 years ago
15

Solve linear system using substitution y=6-2x 7x-y=3

Mathematics
1 answer:
Naddik [55]3 years ago
5 0
\left \{ {{y=6-2x} \atop {7x-y=3}} \right. \\\\substitute\ first\ equation\ into\ the\ second\\\\
7x-(6-2x)=3\\\\
7x-6+2x=3\\\\
9x-6=3\ \ \ | add\ 6\\\\
9x=9\ \ \ | divide\ by\ 9\\\\
x=1\\\\
y=6-2*1=6-2=4
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