Question

Решите систему x+y=200 0,1x+0,3y=50

Answer 1

1)
x+y=200
0,1x+0,3y=50

2)
x=200-y
x+3y=500

3)
x=200-y
x=500-3y

4)
x=200-y
200-y=500-3y

5)
x=200-y
2y=300

6)
x=200-150
y=150

7)
x=50
y=150