Find the equation of a horizontal line passing through the point

Question:

Find the equation of a horizontal line passing through the point (4, - 2).

 

Solution:

Equation of line parallel to x - axis (horizontal) is y = constant, as y -

coordinate of every point on the line parallel to $x$ - axis is $-2 i . e$. constant. Therefore equation of the line parallel to $x$ - axis and passing through $(4,-2)$ is $y=-2$.

 

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