The line goes through the points (8,5) and (9, 6)

Answer 1

(6 - 5)/(9 - 8) = 1

5 = 1(8) + b

5 = 8 + b

b = -3

y = x - 3

or...

y - 5 = 1(x - 8)

y - 5 = x - 8

y = x - 3