Question 344804
Hi,
Using the fact the sum of supplementary angles is 180:
A + B = 180
A = 180-B
.
A = 8(B) is true as stated in the question
.
180 -B =8*B
.
180 = 9B  
{{{B=highlight( 20)}}}
A = 8*B = {{{highlight(160)}}}

Check Your Answer
20 + 160 = 180