Question

Реши систему уравнений способом алгебраического сложения. {u−3t=52 {u−4t=40 Ответ: u= t=

Answer 1

$\left \{ {{u-3t=52;|*(-1)} \atop {u-4t=40;}} \right. \ \textless \ =\ \textgreater \ +\left \{ {{3t-u=-52;} \atop {u-4t=40;}} \right. \ \textless \ =\ \textgreater \ \left \{ {{t=12;} \atop {u=88.}} \right. \\ -t=-52+40=-12; \\ t=12. \\ u=40+48=88.$
Ответ: $(88;12)$.