The slope intercept equation will be y = 15x + 95
The cost for 77 people is $1250
Using slope intercept equation.
y = mx + b
where
m = slope
b = y-intercept
Therefore,
let
number of  attendance = x
y = mx + 95
The slope intercept equation is as follows:
y = 15x + 95
Let find the cost for 77 people.
y = 15x + 95
y = 15(77) + 95
y = 1155 + 95
y = 1250
The cost of 77 people is $1250
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