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Solve using substitution: {2x+y=153x−4y=6\begin{cases} 2x + y = 15 \\ 3x - 4y = 6 \end{cases}{2x+y=153x−4y=6
(6,3)(6, 3)(6,3)
(4,7)(4, 7)(4,7)
(5,5)(5, 5)(5,5)
(7,1)(7, 1)(7,1)