Question 1050799
{{{x+y=180}}}

{{{x=8+3y}}}



{{{x+y=180}}}
{{{x-3y=8}}}
let the software do the rest.
*[invoke linear_substitution "x", "y", 1, 1, 180, 1, -3, 8 ]


another method

let x be the smaller angle then 8+3x will be the large angle.
{{{x+3x+8=180}}}
*[invoke explain_simplification "x+3x+8=180" ]