X-y=2 2x+y=7xaiw soruyuu bulun

Question

X-y=2 2x+y=7xaiw soruyuu bulun

Answer 1

х-у=2

2х+у=7

х+2х-у+у=2+7

3х=9

х =  9 : 3

х = 3

2*3+у=7

6+у=7

у=7-6

у=1

Проверка:

3-1=2

2*3 +1 = 6 + 1 =7

Овет: х=3;  у=1.

Answer 2

X=2+y
2(2+y)+y=7
4+3y=7
3y=7-4
3y=3
y=1

x=2+y
x=3