Question

x+y=24

x-y=19

Answer 1

х=24-y

x-y=19

 

x=24-y

24-y-y=19

 

x=24-y

-2y=19-24

 

x=24-y

2y=5

 

x=24-y

y=5/2=2,5

 

x=24-2,5=21,5

y=2,5

Answer 2

1)x+y=24 можно так х=23 а у=1

2)х-у=19 => х=20 у=1