math

In 1992,the life expetency of males was 65.1 years. In 1999, it was 67.5 years. Let E represent the life expetency of in year t and let t represent the number of years since 1992. make this into a linear function E(t)=___t+___

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  1. E=mt+b
    when t = 0, E = 65.1
    so
    65.1 = m(0) + b = b
    then
    E = m t + 65.1
    second point
    67.5 = m(1999-1992) + 65.1
    2.4 = 7m
    m = 2.4/7
    so
    E = (2.4/7) t + 65.1

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