Question

(b) A related rule of thumb is that a typical man who is 70 inches tall weighs 170 pounds. On the basis of these two rules of thumb, use a formula to express the trend giving weight w as a linear function of height h.
w(h)= ?

Answer 1

it sounds like weight (w) is directly related to height (h)

so we have direct variation

w = k*h

where k is some constant (a fixed number)

Answer 2

plug in the given weight and height, then solve for k


w = k*h
170 = k*70


I'll let you isolate k

Answer 3

k=2.4

Answer 4

I'm getting 170/70 = 2.42857142857142

if you round that to one decimal place, then you get k = 2.4

so it looks good

Answer 5

so `w(h) = 2.4*h`

whatever the height is, the weight will be approximately 2.4 times the height

weight = 2.4 times height

Answer 6

but w= 2.4 * 70 isn't it, its slope

Answer 7

well they want a general formula

not just that specific value

Answer 8

so you replace the 70 with some general height h

Answer 9

to get `w(h) = 2.4*h`

Answer 10

that isn't it either :(

Answer 11

its 5h-180
thanks!

Answer 12

hmm strange, it seems like they're converting but I'm not sure

Answer 13

does it use another value other than (70, 170)?

Answer 14

nope

Answer 15

I notice it says part B

what was part A about?