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Explain how to convert measurements in the metric system

Jack has a rectangular piece of land, the area of which is represented by a1 = 9.5l. his brother has a different rectangular piece of land, the area of which is represented by a2 = l(14 − l). let a represent the area in square meters and l represent the length in meters of the pieces of land. the two equations plotted on a graph meet at a point as shown in the image

If a and b are real numbers, then |a-b| is always, sometimes or never equal to |b-a| ?