Chapter 1.2, Problem 81E

Demographics. The average number of persons per house-hold in the United States has been shrinking steadily for as long as statistics have been kept and is approximately linear with respect to time. In $1980$ there were about $2.76$ persons per household, and in $2015$ about $2.54$.

(A) If $N$ represents the average number of persons per house-hold and $t$ represents the

number of years since $1980$, write a linear equation that expresses $N$ in terms of $t$.

(B) Use this equation to estimate household size in the year $2030.$