Question

Is this relationship proportional or not and give at least proof. Time: 1, 2, 3, 4, 5, 10 Pages: 65,130,195,260,325,650 ​

Answer 1

A relationship is proportional if the ratio between the output and the input is constant:

`y=kx \iff (y)/(x) = k`

In your case, we have

`(65)/(1) = (130)/(2) = (195)/(3) = (260)/(4) = (325)/(5) = (650)/(10) = 65`

This means that it takes the reader one unit of time to read 65 pages. So, after 2 units of time, he reads 130 pages, and so on.