Question

решите уравнение
Х-140=У
0,6у-0,7х=64​

Answer 1

Ответ:

$\left \{ {{x-140=y} \atop {0,6y-0,7x=4}} \right.$

$\left \{ {{x=y+140} \atop {0,6y-0,7x=64}} \right.$

$\left \{ {{x=y+140} \atop {0,6y-0,7(y+140)=64}} \right.$

$\left \{ {{x=y+140} \atop {0,6y-0,7y-98=64}} \right.$

$\left \{ {{x=y+140} \atop {-0,1x-98=64}} \right.$

$\left \{ {{x=y=140} \atop {-0,1x=162}} \right.$

$\left \{ {{x=y+140} \atop {y=1620}} \right.$

$\left \{ {{x=-1480} \atop {y=-1620}} \right.$