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OpenStudy (anonymous):
Using substitution to solve the system x = 2y + 3 and 4x - 5y = 9, which of the following could be the first step? a: x - 2y = 3, 4x - 5y = 9 b: 4(2y + 3) - 5y = 9 c: x + 2y = 4x - 5y d: 5x - 3y = 12 e: - 3x + 7y = -6
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