Answer
$C = 12n +50$
Work Step by Step
This is the equation we will start off with. m is the slope, and b is the y-intercept.
$C = mn + b$
It costs 12 dollars per person, so the slope is $12$.
$C = 12n + b$
If no one came, the price the is charged would be $50$. This is the y-intercept.
$C = 12n +50$