Question

A limited-edition poster increases in value each year. After 1 year, the poster is worth $20.70. After 2 years, it is worth $23.81. Which equation can be used to find the value, y, after x years? (Round money values to the nearest penny

Answer 1

(1,20.70)(2,23.81)
slope(m) = (23.81 - 20.7) / (2 - 1) = 3.11

y = mx + b
slope (m) = 3.11
(1,20.70)...x = 1 and y = 20.70
now we sub
20.70 = 3.11(1) + b
20.70 = 3.11 + b
20.70 - 3.11 = b
17.59 = b

ur equation is : y = 3.11m + 17.59