The equation youre using is y=mx+b
b is the y int which 3 and the slope between the points is 5/2 so your equation is y=5/2x+3
Let x be the number of MP3 players the company produces per week.
If c is the total cost of the company per week, then
c = 45x + 1500
Using regular OLD math I get the answer...
466,452
