Question

решите систему уравнений
2х=у
х+2у=10

Answer 1

$left { {{2x=y} atop {x+2y=10}} right. left { {{y=2x} atop {x+2*2x=10}} left { {{y=2x} atop {5x=10}} right. right. left { {{y=2x} atop {x=2}} right. left { {{y=2*2} atop {x=2}} right. left { {{y=4} atop {x=2}} right.$
 

ответ: (2,4)