While writing the co-ordinates of a point , its ordered pair is always in the form of ( x , y ) where x = x-coordinate of the point & y = y-coordinate of the point.
In Quadrant 1 , the coordinates of a point is always = ( +x , +y ) because Quadrant 1 lies between the positive side of x-axis & positive side of y-axis.
In Quadrant 2 , the coordinates of a point is always = ( -x , +y ) because Quadrant 2 lies between the negative side of x-axis & positive side of y-axis.
In Quadrant 3 , the coordinates of a point is always = ( -x , -y ) because Quadrant 3 lies between the negative side of x-axis & negative side of y-axis.
In Quadrant 4 , the coordinates of a points is always = ( +x , -y ) because Quadrant 4 lies between the positive side of x-axis & negative side of y-axis.
SOLUTION :-
(2 , -1) is in Quadrant 4 because it's x-coordinate is positive whereas its y-coordinate is negative.
(-5 , 3) is in Quadrant 2 because its x-coordinate is negative but y-coordinate is positive.
(4 , 3) is in Quadrant 1 because both its x-coordinates & y-coordinates are positive.
(-2 , -3.5) is in Quadrant 3 because both its x-coordinates & y-coordinates are negative.
(0.5 , 1.75) is in Quadrant 1because both its x-coordinates & y-coordinates are positive.
