Solve the system of equations by substitution. 5x + y = 9 y = 4x Select the correct choice below and, if necessary, fill in the answer box to complete your choice. OA. There are a finite number of solutions. The solution set is (Simplify your answer. Type an ordered pair.) OB. There are infinitely many solutions. The solution set is {(x₁__)}. (Simplify your answer. Type an expression in terms of x.) OC. The solution set is Ø.

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