math

A catering fi rm charges a fi xed cost for overheads and a price per person. It is known
that a party for 20 people costs $557, whereas a party for 35 people costs $909.50.
What is the fixed cost and the cost per person charged by the company?

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  1. pretend you are given two points (20,557) and (35,909.5)
    and your equation is
    y = mx + b, where y is the cost , m is the price per person, and b is the fixed overhead.
    sub in the two points and you have two equations in two unknowns.
    Carry on from there.

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