Question 346135
1.{{{2r-7s=-38}}}
2.{{{7r+2s=79}}}
Multiply eq. 1 by 7 and eq. 2 by (-2) and add them together.
{{{14r-49s-14r-4s=-266-158}}}
{{{-53s=-424}}}
{{{highlight(s=8)}}}
Then from eq. 1,
{{{2r-56=-38}}}
{{{2r=18}}}
{{{highlight(r=9)}}}