Question

Determine the solution to the system. Solve by Substitution.
3a + b = 30
b = 3a

Answer 1

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