Question

х+y=3 i x-y=1 ОТДАМ 60 БАЛОВ

Answer 1

x + y = 3
x - y = 1
x + y = 3
x = 1 + y
1 + y + y = 3
y = 1
x = 1 + 1
x = 2
( x , y ) = ( 2 , 1 )