Question 952316

If < {{{a}}} and < {{{b}}} are supplementary, their sum is {{{180}}}°;

{{{a+b=180}}}.......eq.1

 and if  < {{{a}}} is {{{9}}} times as large as {{{b}}}, then we have:

< {{{a=9b}}}.....eq.2 substitute it in eq.1

{{{9b+b=180}}}.......eq.1

{{{10b=180}}}

{{{highlight(b=18)}}}°

go to < {{{a=9b}}}.....eq.2 substitute {{{18}}} for {{{b}}} 

 < {{{a=9*18}}}

< {{{highlight(a=162)}}}°