Answer:
3y = 150000 + 1100x ; x as time in years and y as amount of investment after x years.
Step-by-step explanation:

Growth in John's investment between year 2005 and 2011 = $(52200 - 50000) = $2200
Years passed to grow that much = 2011 - 2005 = 6 years


Value of investment after x years = (Initial investment) + (Rate of growth) × (Years of investment)
Value of investment = y
Years of investment = x
rate of growth =

Initial investment = $50000

∴ 3y = 150000 + 1100x
slope of above equation of line is
which the rate of growth of market.