To subtract a positive number, you go the specified number of units to the left. To subtract a negative number (which is the same as adding the corresponding positive number), you go to the right.
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If the y coordinate does not change, it is a horizontal line.
It shows multiple numbers in order to use in addition, subtraction, etc.
The horizontal number line on a coordinate plane is called the x-axis, and the vertical number line on a coordinate plane is called the y-axis.
coordinate, or coordinate value
The straight line that best fits the data on a coordinate plane is the Line Of Best Fit.