Question 28627
To begin this problem, keep in mind that "x" is the number of years.

A) The initial value of the equipment means that they have had it for 0 years so sub in 0 for "x".

y = 30,000 - 1,000x
y = 30,000 - 1,000(0)
y = 30,000 - 0
y = 30,000

B)Number of years goes to 4 so sub in 4 for "x."

y = 30,000 - 1,000x
y = 30,000 - 1,000(4)
y = 30,000 - 4,000
y = 26,000

C)Number of years goes to 6 so again, sub in for "x."

y = 30,000 - 1,000x
y = 30,000 - 1,000(6)
y = 30,000 - 6,000
y = 24,000

D) Graph.  All you need to do is use your year values as "x" coordinates and the "y"'s you solved for as "y" coordinates.

Hope it helps.  :)