Question 65767
The cost of the producing a number of items x is given by C=mx+b, in which b is the fixed cost and m is the variable cost (the cost of producing one more item).

a). If the fixed cost is $40.00 and the variable cost is $10.00, write the cost equation. 

b). Graph the cost equation.

The equation I came up with is C=10x+40. 
You're right about the equation, so give yourself a high five!
To graph this, give yourself a scale of 1 unit per 10.  (Just count by tens)
Plot a point on the y axis at 40, then use the slope, m=rise/run, go up 10 and right 1 and plot another point at (1,50).  Connect the points and you have a line.
{{{graph(300,200,-1,10,-5,140,10x+40)}}}
Happy Calculating!!!