Y = 3x + 48 where x is your number of years. I got 48 by multiplying 4 and 12 since there are 12 inches in a foot. (:
Answer: 
Step-by-step explanation:
- Original equation:

- Subtract 5x from both sides of the equation:

- Divide both sides of the equation by -1:

- Divide both sides of the equation by 3 to get y on the left, leaving the equation in
form: 
- Evaluate. Slope is equal to m in this form, so the slope is
.
Hope this helps!
This is just like an exponential growth equation...
Final=initial*rate^periods
25000=12500(1.0525)^t
2=1.0525^t
ln2=t ln1.0525
t=ln2/ln1.0525
t=13.55
t=14 yrs