y=2x looks like two different equations:
When
x>=0: y=2x
x<0: y=2x
 is a magnitude operator that makes it’s parameter positive. y=2x is a straight line, starting from the top left, passing (0,0). y=2x will bounce that off the x axis.

What is the main difference between this two equations : y=2x and y=2x ? 
the magnitude operator is  so y = 2x = positive data 2x , x=>0 to y=> 2x
and normal 2x , x=>0 to y=> 2x
Computational mathematics need to study
research and development in india
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