Question 898076
Linear pairs are supplementary angles (they sum to 180).
{{{A+B=180}}}
{{{A=2B+6}}}
Substituting,
{{{(2B+6)+B=180}}}
{{{3B+6=180}}}
{{{3B=174}}}
{{{B=58}}}
Then,
{{{A=2(58)+6}}}
{{{A=122}}}