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For a point lying on the $x$-axis, which of the following is always true about its coordinates?
AThey are of the form $(x,0)$
BThey are of the form $(0,y)$
CThey are of the form $(x,x)$
DThey are always positive
Answer & Solution
Correct answer: A. They are of the form $(x,0)$
Any point on the $x$-axis has zero distance from the $x$-axis, so its ordinate is 0. Hence its coordinates are of the form $(x,0)$.
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