When the coordinate satisfies the original inequality, if a stays the same, b must be greater than its previous value to satisfy the new inequality.
It should be noted that inequality provides an interval to the solution.
This is illustrated graphically. Let's illustrate this with an example, suppose a =1, b = 3
a - b < 0.
1 - 3 < 0
-2 < 0
If a stays the same value, b will be greater than 1.
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