Multiple Choice

An operations manager is reviewing system boundary lines defined by the following four equations: ⓐ y=−6y = -6, ⓑ 5x−3y=155x - 3y = 15, ⓒ x=7x = 7, and ⓓ y=25x−1y = \frac{2}{5}x - 1. To minimize effort during the mapping process, which of these equations should the manager recognize as a horizontal line that can be graphed immediately without calculation?

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Updated 2026-09-18

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