Question 14689
a= computer
b= moniter

{{{a+b=48}}}
and
{{{2a=b}}}
then substitute 2a for b
{{{a+2a=48}}}
{{{3a=48}}}divide
{{{a=16}}}
then 16 for a
{{{16+b=48}}}subtract
{{{b=36}}}

:)Danny