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The -10 in front of the |x| does two things.  First, it makes all the y values ten times greater than just |x| alone; hence it stretches the values by a factor of 10.   For example, if x=-2, |-2| = 2, but -10|-2| = -20, ten times more.  Second, it makes the y values negative instead of positive.  Hence the negative sign reflects the values across the x-axis.