BRUCE S. answered 03/04/13
Learn & Master Physics & Math with Bruce S
Hi Rj,
Just straight forward algebraic re-arrangement.
18000-1200x > 4700
subtract 18000 from bothsides:
18000 - 18000 - 1200x > 4700 -18000
- 1200x > -13300
multiply both sides by -1 (remember to reverse the > sign!! because of the -1 factor)
1200x < 13300
divide by 1200
x < 11.08
car will be worth over $4700 for just over 11 years
(assumption: depreciation is $1200 per year)
Good Luck! BruceS