Question

[PLEASE HELP - I've been waiting 40 minutes. I will give you a medal if you help. Please help me.]

Suppose the maximum healthy weight for a person who is 5 feet 9 inches tall is 150 pounds, and the maximum healthy weight for someone 6 feet 7 inches tall is 200 pounds. The relationship between weight and height here is linear.


(a) Find a linear equation that gives the maximum healthy weight y for a person whose height is x inches over 4 feet 9 inches. (Thus x = 0 corresponds to 4 feet 9 inches and x = 3 to 5 feet,etc.)

Answer 1

i cannot work with feet, inches so lets convert to inches

Answer 2

OK, x=0 equals 4' 9" and x=3 equals 5'

Answer 3

five foot nine is 69 inches
six foot seven is 79 inches

Answer 4

four foot nine is 57 inches

Answer 5

so we subtract

Answer 6

No, but those values need to be relative to 4' 9". I need the equation that gives the maximum healthy weight y for a person whose height is x inches OVER 4 feet 9 inches.

Answer 7

\[69-57=12,79-57=22\]

Answer 8

find the equation of the line through the points \((12,150)\) and \((22,200)\) that is all

Answer 9

you cannot work in math with units like so many feet so many inches
you have to have one unit of measurement to find an equation like this

Answer 10

you can almost do it in your head
the slope is \(\frac{50}{10}=5\)