(a)

The function represents the value of the machine after years.

represents the original value of the machine is $ .

at , hence the point on the graph of the function is .

Company depreciate the machine using straight line method for  years

then , hence the point is .

Consider the two points and .

The Slope of the function is .

The general form of linear function is , here is the -intercept.

From the point the value of

The function .

(b)

The function is .

The age of the machine cannot be negative and the value of the machine is $ after years.

The domain of the function is or .

(c)

Graph:

The function is.

The Slope of the function is .

From part(a), consider the point .

The point is , move the point untis downward and unit right to the point .

(d)

Find the book value of the computer after years.

Substitute in the function .

The computer have a book value of $ after years.

(e)

Find the no.of years when the book value is $.

Substitute in the function.

After year ,the book value of the computer is $.

(a) The function .

(b) The domain of the function is or .

(c) Graph the function is is

(d) The computer have a book value of  $ after years.

(e) After year ,the book value of the computer is $.