The points (1, 2) and (4, 2) both have the same y-value, so that is the horizontal line y = 2.
The given point has y-value of 3, so the line passing through it will be
... y = 3
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There is no x-term because the slope is 0. We could write it as
... y = 0x +3
but this simplifies to
... y = 3
