Question

resolva o sistema abaixo

x+y=100
x-y=60 ​

Answer 1

Resposta:

x + y = 100

x - y = 60

x - y = 60

x = 60 + y

x + y = 100

60 + y + y = 100

2y = 100 - 60

y = 40/2

y = 20

x - y = 60

x - 20 = 60

x = 60 + 20

x = 80