Question

x + y = 1200 20 x
+ 10 Y igual 18000​

Answer 1

Resposta:

x = y = 600

Explicação passo-a-passo:

x + y = 1200 (1)

20x + 10y = 18000 (2)

x = 1200 - y

20 . (1200 - y) + 10y = 18000

24000 - 20y + 10y = 18000

24000 - 10y = 18000

24000 - 18000 = 10y

6000 = 10y

y = 600

x + y = 1200

x = 1200 - y

x = 1200 - 600

x = 600