Question 345478
By definition,
{{{A+B=180}}}
Substitute,
{{{3x-7+11-1=180}}}
{{{3x+3=180}}}
{{{3x=177}}}
{{{x=59}}}degrees
.
.
.
{{{A=3(59)-7}}}
{{{A=170}}}degrees
{{{B=10}}}degrees