Business and finance?

Question

The cost of 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 and the variable cost is $10, write the cost equation.
(b) Graph the cost equation.

Answer 1

Cost equation : C = 10x + 40

If 2 items are produced, x = 2, so the Cost of producing the 2 items is C = 10*2 + 40 = 20 + 40 = 60

If 3 items are produced, x = 3, so the Cost of producing the 3 items is C = 10*3 + 40 = 30+ 40 = 70

Sorry, I don't know how to draw graphs in the answer box in Y!A