Question

If y varies directly with x, given x = 4 and y = 8. What is the value of k (constant of proportionality)?

Answer 1

2

Explanation:

If y y varies directly with x, this is expressed as;

y ∝ x

y = kx

k is the constant of proportionality;

Given

x = 4 and y = 8

Substitute;

8 = 4k

4k = 8

k = 8/4

k = 2

Hence the constant of proportionality k is 2