Question

Resolva o sistema x/2 = y/5 x + y = 21

Answer 1

Resposta:

x = 6; y = 15

Explicação passo-a-passo:

x/2 = y/5

x + y = 21

5x = 2y

x + y = 21

5x - 2y = 0

x + y = 21 (2)

5x - 2y = 0

2x + 2y = 42 (+)

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7x = 42

x = 42/7

x = 6

5x = 2y

5.6 = 2y (:2)

5.3 = y

15 = y

y = 15