Question 984160
{{{system(b/a=5/6,(b+3)/(a+3)=6/7)}}}


Goal is solve for a-8.


{{{b=5a/6}}}
-
{{{7(b+3)=6(a+3)}}}
{{{7b+21=6a+18}}}
{{{7b-6a=-3}}}
{{{6a-7b=3}}}
substitute for b.
{{{6a-7(5a/6)=3}}}
{{{36a-35a=18}}}
{{{a=18}}}------Current age for Alisha


She was 10 years of age, 8 years ago.