a=multiplier (determiners the direction)
a>1=stretch
0<a<1=compression
a<0 negative = flipped over x axis
b-base (never a negative base)
b>1=growth (always increasing)
0<b<1= Decay (always decreasing)
h=lt/rt
k=up/down
range y>k is positive
Asymptote- y<k is negative
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