Write a Linear Cost Function Equation for Each of the Following

Write a linear cost function equation for each of the following conditions. Use y for estimated costs and X for activity of the cost driver.
a. Direct manufacturing labour is $20 per hour.
b. Direct materials cost $8.00 per cubic metre.
c. Utilities have a minimum charge of $2,000 plus a charge of $0.05 per kilowatt hour.
d. Factory supplies average $10 per day plus $1.00 for each machine-hour per day.
e. Total manufacturing amortization includes $5,000 for straight-line plant amortization plus machinery amortization of $100 for each day operated.