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