Algebra
posted by kim on .
The life expectancies for men and women in the United States can be approximated by the following formulas:
Women: E= 0.126t+76.74
Men: E=0.169t+69.11
where E represents the length of life in years and t represents the year of birth,measured as number of years since 1975.
a. Write a single equation that can be used to determine in what year of birth
the life expectancy of men and women would be the same.
b. Solve the equation in part a
c. What is the life expectancy for the year of birth determined in part b?

0.126t+76.74 = 0.169t+69.11
or
.043 t = 7.63
or
t = 177
year = 1975 + 177 = 2152
if t = 177
E = .126(177) + 76.74
E = 99.1 years old