Question 1146742
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you are 18 years old you have a hair that is 17 centimeters long, and your hair grows about 12 centimeters each year. Let H(t) be the length, in centimeters, of that hair t years after age 18.
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t, time since age of 18;
t=0, H=17, or point  (t,H) of  (0,17).


Basic Model {{{y=mx+b}}}, more specific as {{{H=mt+17}}} to fit your description.  Note, the vertical axis intercept was described.


Slope m was described as m=12 centimeters per year.


{{{highlight(H(t)=12t+17)}}}


(b)

Question tells you H(t)=117.  Solve for t.