Question

система рівнянь 2-3у=12. 2х +4у=90​

Answer 1

Ответ:

$\left \{ {{2-3y = 12} \atop {2x + 4y =90}} \right. \\\\\left \{ {{-3y = 10} \atop {2x + 4y =90}} \right. \\\\\left \{ {{y=-10/3} \atop {2x +4 * (-10/3) = 90}} \right. \\2x = 90 + 40/3 \\2x= \frac{270 + 40}{3 } \\x = \frac{310}{6 }\\x = \frac{155}{3 }$