Question 120285
{{{5x + 3t = 19}}} 
{{{5x - 3t =  1}}}.............let {{{t=y}}}

then you have:

{{{5x + 3y = 19}}}
{{{5x - 3y =  1}}}

solution:


*[invoke solving_linear_system_by_substitution 5, 3, 19, 5, -3, 1]