Question 314485
1.{{{A+B=21}}}
2.{{{3*A=2*B-2}}}
Multiply eq. 1 by 3,
{{{3A+3B=63}}}
Now substitute eq. 2,
{{{2B-2+3B=63}}}
{{{5B-2=63}}}
{{{5B=65}}}
{{{highlight(B=13)}}}
Then from eq. 1,
{{{A+13=21}}}
{{{highlight(A=8)}}}