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in 1991 the life expectancy of males in a certain country was 68.2 years. in 1995 it was 70.8 years. let e represent the life expectancy in year t and let t represent the number of years since 1991

  • algebra -

    look at it as two ordered pairs (0,68.2) and (4,70.8)

    find the equation in the form

    e = mt + b, just like you would find the equation of the line y = mx + b

    since (0,68.2) is the y-intercept
    you already know
    e = mt + 68.2

    just find the slope m and you are done

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