A general linear equation is
![y=mx+b](https://img.qammunity.org/2023/formulas/mathematics/high-school/smsb8cbft03lwblmi49nf2l6jby2ofxzws.png)
where y is the dependent variable, m the slope or the change per unit, x the independent variable and b the fixed value
then we can identify each one
the dependent variable or the Outcome is P(total pay)
the change per unit is the price per each copy then (70$)
the independent variable is the number of copies N
the fixed values is the base salary 2300
then
![P=70N+2300](https://img.qammunity.org/2023/formulas/mathematics/college/5j0qin9o3o5378i55lgmeeg7nuwly09cd2.png)
no to find the total pay to 24 copies we replace N=24
![\begin{gathered} P=70(24)+2300 \\ P=3980 \end{gathered}](https://img.qammunity.org/2023/formulas/mathematics/college/o78cz97evtik39m4md6cq6y4jzx9tdm014.png)
total pay if Juan sells 24 copies is $3980