Answer: y = 10 years
Explanation:
Hint: y=year
New Jersey = Georgia
NJ pop. - (NJ yearly amount)(y) = GA pop. + (GA yearly amount)(y)
9,000,000 - (100,000y) = 4,000,000 + 400,000y
9,000,000 - 4,000,000 = 400,000y + 100,000y
5,000,000 = 500,000y
5,000,000/500,000 = y
10 = y
y = 10 years