10. A point is such that (abscissa of the point, other than zero) that it equals to the ordinate of the point. In which quadrants can the point lie??

Dear student,

If abscissa and ordinates are equal ,
​​​​​​x=y=a   let,


then it will lie in first quadrant,


or 
-x=-y=-a

then it will lie in the third quadrant.


Regards