To determine which ordered pair is part of the solution set for the equation \( y = 2x + 5 \), we can substitute each x-value from the pairs into the equation and check if the resulting y-value matches.
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For \( (1, 2) \): \[ y = 2(1) + 5 = 2 + 5 = 7 \] So, \( (1, 2) \) does not satisfy the equation.
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For \( (1, 7) \): \[ y = 2(1) + 5 = 2 + 5 = 7 \] So, \( (1, 7) \) satisfies the equation.
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For \( (3, -1) \): \[ y = 2(3) + 5 = 6 + 5 = 11 \] So, \( (3, -1) \) does not satisfy the equation.
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For \( (7, 1) \): \[ y = 2(7) + 5 = 14 + 5 = 19 \] So, \( (7, 1) \) does not satisfy the equation.
The only ordered pair that is part of the solution set for the equation \( y = 2x + 5 \) is \( \boxed{(1, 7)} \).