The equation yˆ=459.678x+1588.906 models the weekly profit of a business, in dollars, where x is the number of radio advertisements they air. What does the y-intercept of the equation represent in context of the situation? The cost of a radio advertisement is about $1600. Without any radio advertising, the weekly profit would be about $1600. The cost of a radio advertisement is about $460. Without any radio advertising, the weekly profit would be about $460.