The bus fare in Atlanta in 1979 was $1.88.
To determine the bus fare in Atlanta in 1979, when it was 2/5 of the fare in 1999, we can set up an equation.
Let x represent the fare in 1979.
Given that the fare in 1979 was 2/5 of the fare in 1999, the equation is:
![\[ x = (2)/(5) * 4.70 \]](https://img.qammunity.org/2020/formulas/mathematics/middle-school/il2anmyr5m0fwqgcfbrj33ytp8tyvoa4uy.png)
Now, calculate the expression on the right side of the equation:
![\[ x = (2)/(5) * 4.70 = 1.88 \]](https://img.qammunity.org/2020/formulas/mathematics/middle-school/vir070rfs7jeffw4bf6em4nhgbgafi5d8h.png)
Therefore, the bus fare in Atlanta in 1979 was $1.88.
This calculation ensures that the fare in 1979 is indeed 2/5 of the fare in 1999, as specified in the problem.