Y=x-8, that is the basic equation or rule you are possibly trying to ask.
The first one and the second??
Given:

Find: Equation.
Sol:
For the equation:
An equation is a mathematical statement with an 'equal to' symbol between two expressions that have equal values.
So the options.

Is an equation.
In the equation find the value of "m"
Isn't it just 6.8? Pretty sure that is the answer