The graph is misleading because it does not start out at 0 inches of rainfall.
To make it accurate, you'd redraw it and start with 0 inches of rainfall and go up from there.
Add up all the rainfall amounts and divide by 11
8 and 5 multiply to 40 but subtract to 3.
Greetings!
"<span>What is the general process for solving an equation with one variable?"...
Typically when solving an equation with one variable, your objective is to
isolate the variable on one side of the equation. This can be done adding/subtracting number to cancel them out on one side. You can also multiply/divide coefficients in order to isolate a variable.
Example:</span>

<span>Add
-4 to both sides to isolate the variable.
</span>

<span>
Simplify.
</span>

Divide both sides by
2 to isolate the variable on one side.


Hope this helps.
-Benjamin