in 1979, the death rate,D, from acute myocardial infarction for people between the ages of 65 and 74 years was 577 per 100,000 people. In 1996, the rate was 262 deaths per 100,000 people. Round to one decimal place in part a. write sentences for your answer in part b and c.

Question

in 1979, the death rate,D, from acute myocardial infarction for people between the ages of 65 and 74 years was 577 per 100,000 people. In 1996, the rate was 262 deaths per 100,000 people. Round to one decimal place in part a. write sentences for your answer in part b and c. 
a.if t is the # of years since 1970, write a linear equation that gives the # of deaths per 100,000 from acute myocardial infarction in year t. 
b. estimate the death rate in 1990. 
c. in what year will the death rate be 114 deaths per 100,000.