## blast234 3 years ago thanks

1. bthemesandtricks

Just a second. I'll get back shortly

2. zepdrix

Lets write it as Height being a function of time. They told us that we can model it as a linear function, so lets do that! :) It will be of the form: y=mx+b So we have a function: h(t)=mt+b So they gave us some information. h(3)=17 h(5)=15 We'll write these as ordered pairs. (3,17) (5,15). We'll find the m value (slope of our line) by using this form. $m=\frac{ y_2-y_1 }{ x_2-x_1 }$Which for us will be written like this:$m=\frac{ h(5)-h(3) }{ 5-3 }$$=\frac{ 15-17 }{ 5-3 }$$=\frac{ -2 }{ 2 }= -1$

3. zepdrix

Ok the last part is asking what is h(8). Just plug 8 in for t :D

4. zepdrix

oh the 20, sorry lemme bcak up :D

5. bthemesandtricks

\good work zepdrix

6. zepdrix

so you've gotten the formula this far: h(t)=-t+b So you can use some of your previous information to solve for b. Plug in the height and time (3,17), and solve for b.

7. blast234

So this will help me get 20

8. blast234

I don't understand

9. zepdrix

so plugging in 3 and 17 gives us this equation 17=-(3) + b b= 17 + 3 = 20 giving us an equation: h(t)=-t+20 Then for your last part, find h(8)

10. zepdrix

it is a line, an equation can be written in the form: y=mx+b If you'll see from my previous notes, we found the slope of the equation (the m value) to be -1.

11. blast234

never mind i understand