Respuesta :

melissa5shen

Answer: (a, b) = (5, 15)

Substituting b for 3a in 3a + b = 30, we have 3a + 3a = 6a = 30. So a = 30/6 = 5. Then, b = 3a = 3(5) = 15. So the solution is (5, 15).

i hope this helped! :D

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