Question 1087347
{{{(matrix(2,3,
-5,1,17,
1,1,5))}}}

Replace R2 with R1+5R2,
{{{(matrix(2,3,
-5,1,17,
0,6,42))}}}
,
,
,
{{{-5x+y=17}}}
{{{6y=42}}}