Question

5х+4у=6, 7х+6у=10 решите систему

Answer 1

Ответ:

x = - 2; y = 4.

Объяснение:

$\left \{ {{5x+4y=6} \atop {7x+6y=10}} \right. \\\left \{ {{x=\frac{6-4y}{5} } \atop {7(\frac{6}{5}-\frac{49}{5}) +6y=10 }} \right. \\\frac{42}{5}-\frac{28y}{5}+6y=10\\ 42-28y+30y=50\\2y=8\\y=4 ;\\x=\frac{6-4*4}{5}=-2$