Question 1043970
{{{system(3y-7x=-29,7x+11y=1)}}}


Rewrite so each equation is in the same format.

{{{system(-7x+3y=-29,7x+11y=1)}}}


Already set for eliminating the x terms to get y.  No changes for that.
Add corresponding members of the equations.



Do this to eliminate y:
{{{system((-11)(-7x+3y)=(-11)(-29),3(7x+11y)=3*1)}}}