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The coordinate plain is given below.

It has two lines perpendicular to each other. In the plane, the horizontal line is x-axis and vertical line is y-axis. The point where both the axis crosses is the origin and it is the point where x and y remains zero. In x-axis, the values to the right of origin are positive and to left are negative. In y axis, the values above the origin are positive and below the origin are negative.

The below 2 examples show you how to plot a point in graph.

=> From the given point (3, -6)

=> X is positive 3 and y is -6

=> So move 3 units to the right on x axis and 6 units down on y axis

=> Draw lines from the point that cuts x axis and y axis respectively.

=> Since, the line cuts at point 3 on x axis and at point 4 on y axis.

=> Therefore x= 3 and y=4