Question

x+y=77. x-y=13. care sun numerele

Answer 1

x+y = 77
x-y = 13 
x = 13+y 

13+y+y = 77
2y = 77-13 
2y = 64 
y = 64:2
y = 32 
x = 32 +13 = 45 

45+32 = 77
45 - 32 = 13 

Answer 2

x = (77+13) / 2 =45 ;

y=(77 - 13) / 2 = 32 ;