Question 66413
Business and finance. In planning for a new item, a manufacturer assumes that
the number of items produced x and the cost in dollars C of producing these
 items are related by a linear equation. Projections are that 100 items will cost $10,000 to produce and that 300 items will cost $22,000 to produce. 
Find the equation that relates C and x.
:
Let's do the problem using the variables x & y: Cost=y
:
Find the slope: m = (y2-y1)/(x2-x1)
In our problem x1 = 100, y1 = 10000; x2 = 300, y2 = 22000
:
Find the slope (m)
m = {{{((22000-10000))/((300-100))}}} = {{{12000/200}}} = 60 is the slope
:
Now use the point/slope equation: y - y1 = m(x - x1)
y - 10000 = 60(x - 100)
y - 10000 = 60x - 6000
y = 60x - 6000 + 10000
y = 60x + 4000
:
Substituting "Cost" for y we have:
Cost = 60x + 4000