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Finding formula of an area question.

Pizzeria Buonapetito makes a triangular-shaped pizza with base width of 18 inches and height 12 inches as shown. Alice wants only a portion of the pizza, so she makes a vertical cut through the pizza and takes the shaded portion. Letting *x* be the bottom length of Alice's portion and *y* be the length of the cut as shown, answer the following questions.

Here is a picture of the details above:

Attachment 25173

Attachment 25174

Here are the problems:

Attachment 25175

I'm having a lot of trouble trying to find a formula for her area for the second interval.

How would I approach these problems? Thank you!

Re: Finding formula of an area question.

for the second triangle (6 < x < 18) ...

shaded area = area of large triangle - area of unshaded smaller triangle