Question

Решить систему уравнений:
{x+y=120
{0,3x+0,2y=151

Answer 1

$left { {{x=120-y} atop {0.3(120-y)+0.2y=151}} right.$
36-0.3y+0.2y=151
36-0.1y=151
-0.1y=115
y=-1150

x=120+1150=1270