Question

daca x +y =1000 si x-y = 868
afla valoarea lui x si a lui

Answer 1

x-y=868, deci x=868+y.
Inlocuim in prima relatie si avem:
868+y+y=1000, deci 2*y= 132, deci y=66. 
x=868+y, deci x=868+66, deci x=934

Answer 2

x+y=1000
x-y=868
x=1000-y
1000-y-y=868
2y=1000-868
2y=132
y=66
x+66=100
x=100-66
x=934