Two angles form a linear pair means they are supplementary and the measures of their angles add up to 180 degrees
other angle = x
one angle = 2x/3 - 5
sum is 180
x + 2x/3 -5 = 180
3x + 2x - 15 = 540
5x = 555
x = 111
other angle = 111
one angle = 2(111)/3 - 5 = 69