example
y=lxl is a V shaped curve ,open up, vertex at 0,0
y=lx-al is a V shaped curve, open up, vertex at a,0
y=-lx-bl is a V shaped curve, open down, vertex at b,0
y=-lx+5l a V shaped curve , open down, vertex at -5,0
two straight lines y=x-5] for x<5
and y=-x+5 x>5
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