X Coordinate

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A 2-dimension coordinate plane consists of two axis perpendicular to each other known as the ‘X-axis’ and the ‘Y-axis’. The horizontal axis is known as the X-axis and the vertical axis is known as the Y-axis and they intersect at the origin. A point in the coordinate plane is represented as (x, y) where ‘x’ is called as the x-coordinate and ‘y’ is called as the y-coordinate. The ‘x-coordinate’ represents the distance on the X-axis of the given point and similarly the ‘y-coordinate’ represents the distance on the Y-axis of the given point from the origin.
 

Example 1:  Given the equation of a line y = 2x – 4. Find the ‘x-coordinate’ of the point where the line crosses the X-axis.
Given: y= 2x – 4
In order to find the point where the line crosses the X-axis, we can plug-in y = 0 because the value of the y-coordinate on the X-axis is 0.
This implies: y = 2x – 4 ==>0= 2x – 4.
This gives: 2x = 4 ==>x= 4/2 = 2.
Therefore the point where the line crosses the x-axis is (2, 0)
The x-coordinate of the point is 2.
 

Example 2: Given the equation of a line y = x – 5. Find the ‘x-coordinate’ of the point where the line crosses the X-axis.

Given: y= x - 5
In order to find the point where the line crosses the X-axis, we can plug-in y = 0 because the value of the y-coordinate on the X-axis is 0.
This implies: y = x – 5 ==> 0= x - 5
This gives: x = 5.
Therefore the point where the line crosses the x-axis is (5, 0)
The x-coordinate of the point is 5.

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