# The cost of a school banquet is $65 plus$13 for each person attending. How do you determine the linear equation that models this problem and what is the cost for 81 people?

$c \left(p\right) = 65 + 13 p$
$\textcolor{w h i t e}{\text{XXXX}}$where $c \left(p\right)$ is the cost function and $p$ is the number of people attending.
$c \left(81\right) = 1128$ (dollars)
$c \left(81\right) = 65 + 13 \left(81\right) = 1128$