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Q.

Which of the following equation represents a straight line which is parallel to the x-axis and at a distance 3 units below it? 


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a

y=9 

b

x=−3

c

y=−3

d

x=0  

answer is C.

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Detailed Solution

Given a straight line parallel to x-axis, and 3 units below it.
Any straight line parallel to x−axis is given by y=k where k is the distance of the line from x−axis.
Here k=−3, because it is below x-axis then the equation of the line is y=−3.
Plotting the graph of the line y=-3,
Question ImageThus, the equation is y=-3.
Therefore, option (3) is correct.
 
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