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Q.

The equation of a line that is parallel to the x-axis at a distance of 4 units above the x-axis is:

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a

y + 4 = 0

b

y - 4 = 0

c

x - 4 = 0

d

x + 4 = 0

answer is B.

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Detailed Solution

detailed_solution_thumbnail

The equation of the line parallel to the x-axis is given by y = constant.

As the y- coordinate of every point on the line parallel to the x-axis is 4, i.e. constant. 

Now the point lies above the x-axis means in the positive direction of the y-axis,

So, the equation of the line is given as y = 4

=> y - 4 = 0

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