Question 1197442
y=a*b^x


{{{ab^x=y}}}


first point
{{{a*b^(-1)=-4}}}
{{{a/b=-4}}}
{{{b/a=-1/4}}}
{{{a=-4/b}}}


second point
{{{ab^2=-0.5}}}
{{{(-4/b)b^2=-0.5}}}
{{{(4/b)b^2=0.5}}}

{{{4b=0.5}}}

{{{b=0.5/4}}}
{{{b=5/40}}}
{{{highlight_green(b=1/8)}}}

.

.