Question 929846
{{{A+B=9}}}
{{{A-B=6}}}
Add the equations together.
{{{A+B+A-B=9+6}}}
{{{2A=15}}}
{{{A=15/2}}}
Then,
{{{15/2+B=9}}}
{{{B=18/2-15/2}}}
{{{B=3/2}}}