Problema Solution

Statistics show that the number of women lining alone in 1990 was 14 million. In 2005, it was 17.2 million.

A) Find the rate of change (slope) and interpret the meaning using a full sentence.

B) During this same time number of men that lived alone in 1990 was 9 million, and in 2005 it was 12.7 Using x=0 for 1990, x=1 for 1991 and so on, write the equation of the line that passes through these two points.

C) Use you equation to predict the number of men living alone in 2015. Remember that x=0 when the year is 1990

Answer provided by our tutors

a. rate of change= (17.2-14)/15=0.21333 millions per year

B. two poits are

(0,9) and (15,12.7)

thus equation of line

(y-9)=(12.7-9)/(15-0) (x-0)

=> y-9= 37/150 x

=> y=37/150x+9

c.for 2015, x=25

y= 37/150* 25+9=15.1667 millions