Question

Encontre o valo de x e y

{x + y = 10
{ x - y = 5

Answer 1

Sistema:

$\mathtt{x + y = 10} \\ \mathtt{x - y = 5} \\ \mathtt{-----} \\ \mathtt{2x~~~~~=15} \\ \mathtt{x = 15\div2} \\ \mathtt{x = 7,5} \\ \\ \mathtt{x + y = 10} \\ \mathtt{7,5 + y = 15} \\ \mathtt{y = 10 - 7,5} \\ \mathtt{y =2,5 } \\ \\ \\ \boxed{\boxed{\mathtt{Resposta: x = 7,5~~~~~~~y= 2,5}}}$

Answer 2

y=10-x

x-(10-x)=5

x-10+x=5

2x-10=5

2x=15

x=7,5

7,5+y=10

y=10-7,5

y=2,5.