Question

qual valor de x e y. x+Y= 30. x-Y=10​

Answer 1

Resposta:

×=20 y=10

Explicação passo-a-passo:

x+y=30 x-y=10

x=30-y ⬅️⬅️⬅️⬅️⬅️x=30-10=20 ×=20

30-y-y=10

2y=30-10

2y=20

y=20÷2=10

y=10