Modeling functions kill me, my brain malfunctions when I try them. I can do easy ones but then they get really complicated. Help with this one would be appreciated.

You have a $70 coupon from the manufacturer good for the purchase of a cell phone. The store where you are purchasing your cell phone is offering a 40% discount on all cell phones. Letxrepresent the regular price of the cell phone.

(a) Suppose only the 40% discount applies. Find a functionfthat models the purchase price of the cell phone as a function of the regular pricex.

(b) Suppose only the $70 coupon applies. Find a functiongthat models the purchase price of the cell phone as a function of the sticker pricex.