M 9101. Orienting Yourself: The Use of Coordinates
Orienting Yourself: The Use of Coordinates
The 2-d Cartesian Coordinate System
We studied about the number line which is one-dimensional, In the chapters on integers, rational numbers, and decimals.
This number line maybe horizontal and vertical.
The two-dimensional coordinate system uses two lines one horizontal and one vertical at right angles to each other joined 0 to 0 marked 'O'.
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Distances are marked off in equal units, on both the axes. Mind that the fistances to the right of O or upwards from O are considered positive, and distances to the left of O or downwards from O are considered negative.
2-D space –> two-dimensional space
x-axis, y-axis and origin
For our convenience, we consider the horizontal lines, the x-axis and other vertical line the y-axis.
The point of intersection of the x-axis and y-axis is called the origin O. its coordinates are (0, 0).
Coordinate axes (the plural of ‘axis’) help us to locate any point in 2-D space using the point’s ‘coordinates’.
Distances from O are marked off in equal units, on both the axes. Distances to the right of O or upwards from O are considered positive, and distances to the left of O or downwards from O are considered negative (Fig. 1.2).
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