Question 339069
1.{{{A-B=4}}}
2.{{{2B-4A=-28}}}
Multiply eq. 1 by (2) and add to eq. 2,
{{{2A-2B+2B-4A=8-28}}}
{{{-2A=-20}}}
{{{highlight(A=10)}}}
.
.
.
{{{10-B=4}}}
{{{highlight(B=6)}}}