Question 954625
{{{y=a*b^x}}} the model to try using.


The two points will give you
{{{3=a*b^0}}},  {{{3=a}}}
and then
{{{12=a*b^2}}}
{{{12=3*b^2}}}
{{{4=b^2}}}
{{{b=2}}}


Put it all-together:
{{{highlight(y=3*2^x)}}}