Question

A proportional relationship is formed when y = 16 and x = 4. What is the value of y when x = 2? The relationship is assumed to be directly.

Answer 1

x=7

Explanation:

Answer 2

y = 8

Explanation:

Given the relationship is direct then the equation relating the quantities is

y = kx ← k is the constant of proportion

To find k use the condition when y = 16, x = 4, then

16 = 4k ( divide both sides by 4 )

4 = k

y = 4x ← equation of proportion

When x = 2, then

y = 4 × 2 = 8