Given:
In 2002, the temperature on the first day of summer was 86°F.
This is 6°F less than it was on the first day of summer the 2001.
Let, the temperature on the first day of summer in 2001 is x°F.
The equation is,
![x-6=86^{}](https://img.qammunity.org/2023/formulas/mathematics/college/n761b07yv6zsddkdk85mijigccuu234llb.png)
Solve the equation,
![\begin{gathered} x-6=86 \\ x=86+6 \\ x=92^(\circ)F \end{gathered}](https://img.qammunity.org/2023/formulas/mathematics/college/42zuul0lsfv3hriiwj8pxo7di3uascvmij.png)
Answer: the temperature on the first day of summer in 2001 is 92°F.