Solve the system by the substitution method. y=-3x-7 2x-3y=10 Select the correct choice below and, if necessary, fill in the answer box to complete your choice. OA. There is exactly one solution. The solution set is (Simplify your answer. Type an ordered pair.) B. There are infinitely many solutions. The solution set is {(x,y)ly=-3x - 7} or {(x,y)|2x - 3y=10}. OC. The solution set is Ø.

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