Question

6 Look at the following pairs of numbers (a, b) which are related by a proportion b= k·a. (5, 20), (6, 24), (7, 28), (8, 32) What is the value of k? A 3 с B. 3.2 C. 4 D. 6 DI Type here to search

Answer 1

Question:

Look at the following pairs of numbers (a, b) which are related by a proportion b= k·a. (5, 20), (6, 24), (7, 28), (8, 32) What is the value of k?

Solution:

Take any of the given points. For example. take the point (a,b) = (5,20) and replace it into the proportion equation

$b\text{ = k.a}$

this gives us:

$20\text{ = k . 5}$

now, solve for k:

$k\text{ = }\frac{20}{5}=\text{ 4}$

then, the correct answer

4