Question

Решите систему уравнений:
/. -2.7у-1.6х=-18.8
\. 3.3х+4.1у=32.9

Answer 1

/. -2.7у-1.6х=-18.8
\. 3.3х+4.1у=32.9

x=5, y=4

Answer 2

$-2.7y-1.6x=-18.8 /*(-1)\\ 3.3x+4.1y=32.9 \\ \\ 1.6x+2.7y=18.8/*(-4.1) \\ 3.3x+4.1y=32.9 /*2.7\\ \\ -6.56x-11.07y=-77.08 \\ 8.91x+11.07y=88.83 \\ \\ 2.35x=11.75\\x=11.75:2.35\\x=5$

$\\ 16.5+4.1y=32.9\\4.1y=32.9-16.5\\4.1y=16.4\\y=16.4:4.1\\y=4 \\ \\ \left \{ {{y=4} \atop {x=5}} \right.$