Question 1011143
Two Angles are Supplementary when they add up to {{{180}}}°. 

if the supplement of angle {{{z}}} is {{{28}}}°  less than angle {{{z}}}, then the measure of the supplement is {{{(z-28)}}}° 

so,{{{z+(z-28)=180}}}°...solve for {{{z}}}

{{{2z-28=180}}}°

{{{2z=180+28}}}°

{{{2z=208}}}°

{{{z=208/2}}}°

{{{z=104}}}°

and its supplement is {{{z-28=104-28=76}}}°