please answer all the questions! also show work and specify which answers belong to which problems/sections. thank you so much! :)

Which equation represents a proportional relationship that has a constant of proportionality equal to 1/5

Lindsay used two points, (x, y; ) and (+2.82), to find the equation of the line, y = mx + b, that passes through the points. y2-y, first, she used the definition of slope and determined that the value of mis x, - . given this information, which expression must represent the value of b?

Bernice paid $162 in interest on a loan of $1800 borrowed at 6%. how long did it take her to pay the loan off?