Question

{x+y=2(x-y) 
{0,4x-0,35y=17 РЕШИТЕ СИСТЕМУ

Answer 1

$left { {{x+y=2(x-y)} atop {0,4x -0,35y= 17}} right.$
$left { {x+y = 2x-2y} atop {0,4x-0,35y = 17}} right.$
$left { {{x = 3y} atop {0,4*3y - 0,35y = 17}} right.$
$left { {{x = 3y} atop {0,85y =17}} right.$
$left { {x = 3y} atop {y = 20}} right.$
$left { {{x = 60} atop {y = 20}} right.$