Problema Solution
The number of years a person born in the united states is expected to live can be approximated by the equation y=0.189x+70.8, where x is the number of years since 1970. Solve this equation for x. Use this new equation to determine in which year the approximate life expectancy will be 80.2 years.
Answer provided by our tutors
y = 0.189x + 70.8
y - 70.8 = 0.189x
(y - 70.8)/0.189 = x
When y = 80.2,
x = (80.2 - 70.8)/0.182
= 49.7
The year, then, would be 1970 +49.7 = 2019.7