If a point lies on line y=−1, then its x-coordinate is and y-coordinate is .
A
-1
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B
1
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C
a positive number
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D
a real number
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Solution
The correct option is D a real number Since it is given that the point lies on the line y = -1, its y coordinate will be -1.
Also, any point on the line y = -1 satisfies the condition. Hence, its x coordinate could be any real number.